The best die grinders, compared.
Top pick: YEARTOP 206127-UK Best value: ORAZIO / Katsu 212505B – About £16.99 for a 16-piece case with 3 mm and 6 mm collets, at 4.4 from 254 reviews. Air use is not printed. Updated October 2026.
A die grinder is a compact high-speed rotary tool with a collet that holds a shanked burr, a mounted stone, a drum or a small disc. You buy one in the UK to clean welds, ports, seams and rust in places a large cutting disc cannot reach. A suitable tool has a collet that matches the shank you already own: 3 mm, 6 mm or 1/4 inch (6.35 mm). Those sizes are not interchangeable. A straight body suits in-line burrs and cavities. A right-angle head suits faces, wheel arches and small sanding discs. An air tool needs free air delivery at about 90 psi (6 bar), not merely a large tank. A cordless tool needs a battery platform you can identify, or packs and a UK 3-pin charger in the box. A disc kit near 12,000 rpm is a different machine from a burr pencil near 20,000 rpm. Look for a safety lock-off, and treat hearing protection as the default. Collet size, air delivery and head shape are set out in the [die grinder buying guide](/hub/tools/die-grinder/sub/die-grinder-buying-guide).
A die grinder is a compact high-speed rotary tool with a collet that holds a shanked burr, a mounted stone, a drum or a small disc.
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Personal buying guide
Question 1 of 2
How will you power it?
The YEARTOP 12 V right-angle kit is the dearest row in this set at about £59.99, with two 2,000 mAh packs, a UK 3-pin charger, a 1/4 inch (6.35 mm) collet and four printed speeds up to 19,700 rpm. The amazon.co.uk line is 5.0 from 2 reviews, which is too small for a durability claim. Those two UK lines say it takes existing 1/4 inch drums and reaches wheel-arch rust. The bullets do not claim a named trade battery slide. It fits you if you want a complete 12 V kit and a right-angle body. Skip it if you need 6 mm shanks or a large review sample.
Pros
Cons
Best for: You want a complete 12 V right-angle kit with a UK charger and 1/4 inch accessories.
Less suitable: Buyers who need 6 mm shanks, a named trade battery slide, or a large UK review count.
Specifications
Common questions
Are batteries and a UK charger in the box?
Yes. The capture lists two 12 V 2,000 mAh packs and a UK 3-pin charger.
Does it take 6 mm burrs?
The listing states a 1/4 inch (6.35 mm) collet, not 6 mm. UK reviews used existing 1/4 inch drums and wire wheels.
Is it compatible with a named trade battery?
The bullets do not claim a named trade slide. The packs are the kit's own 12 V batteries.
The Anesty mini air angle kit at about £35.90 is the richest boxed 90-degree row: dual collets, twenty 2 inch discs and a 20,000 rpm claim. Working pressure is 90 psi. Air consumption in CFM or L/min is not stated. The amazon.co.uk line is 4.6 from 290 reviews, the largest sample in this set. Captured UK lines are short and positive, and they do not describe free-air delivery. It fits you if you want one air body for both 6 mm burrs and 2 inch discs. Skip it if you need a printed air-consumption figure or a straight pencil.
Pros
Cons
Best for: You want a 90-degree air kit that can run 3 mm and 6 mm collets and 2 inch discs.
Less suitable: Straight-body burr work, or buyers who need a printed air-consumption figure before they buy.
Specifications
Common questions
What disc size is in the kit?
The listing states twenty 2 inch quick-change discs and a pad holder with a 1/4 inch shank.
Which collets are supplied?
A 3 mm collet and a 6 mm collet are in the box list. The title also prints 1/4 inch.
What air use is printed?
Working pressure is 90 psi. Air consumption in CFM or L/min is not stated.
The WORKPRO WG803 at about £21.99 is a straight air pencil with dual collets, rear exhaust and a printed 25,000 rpm. The listing states 90 psi and 85.5 L/min. That figure is listing text, not a measured free-air test. The amazon.co.uk line is 4.6 from 73 reviews. UK text likes the rubberised body and confined-space work, and it flags coarse throttle control, high air use, and one tool that stopped after two months. The table weight is 500 g and a bullet says 0.33 kg. It is the top pick if you already have a compressor and want 3 mm and 6 mm collets. Skip it if you need a feathering regulator or a named trade body.
Pros
Cons
Best for: You have a compressor and want a straight dual-collet air pencil for light metal work.
Less suitable: Buyers who need variable speed, low air demand, or a documented long-duty trade tool.
Specifications
Common questions
What air figures does the listing print?
The amazon.co.uk capture states 90 psi and 85.5 L/min. That is listing text, not a measured free-air test.
Which collets are in the box?
The bullets list a 3 mm collet and a 6 mm collet. The title also prints 1/4 inch and 1/8 inch for those sizes.
Is this cordless?
No. The table lists the power source as air-powered.
The Sealey SA671 at about £29.62 is the named UK trade brand in this set: straight body, safety catch, and 22,000 rpm on the table as both minimum and maximum. UK reviews describe an adjustable speed. The amazon.co.uk line is 4.5 from 144 reviews. UK text praises steel and CR-V work, and it warns about air hunger, a German BSP coupler that needed a British adapter, and one six-month thread failure that Sealey replaced. Operating pressure and air consumption are not on the table. It fits you if you want a Sealey straight grinder and already have enough free air. Skip it if your compressor only keeps pressure in short bursts.
Pros
Cons
Best for: You want a Sealey straight air grinder and already have enough free air delivery.
Less suitable: Tiny tank compressors, or buyers who need dual collets confirmed in the box list.
Specifications
Common questions
What air supply does the listing specify?
Operating pressure and air consumption are not on the amazon.co.uk table. UK reviews say a 50 L hobby tank struggles and that free-air delivery matters more than the gauge.
Which collets are in the box?
The listing states 6 mm shanks and chuck spanners. Some UK reviews mention 3 mm and 6 mm connections. Check on delivery.
Is the airline fitting British BSP?
One UK review says the coupler was a German BSP fitting and the buyer bought a British BSP adapter.
The ORAZIO-titled Katsu 212505B kit is about £16.99 with a case, stones and dual collets, at a stated 20,000 rpm. The amazon.co.uk line is 4.4 from 254 reviews. Operating pressure and air consumption are not on the table. UK text likes the ready-to-run case on a 100 L class compressor if you oil it. Kit stones get binned, noise is high, and one chuck would not hold bits. It is the best value if you want the cheapest boxed starter set and you will oil it. Skip it if you need printed air consumption or a proven collet.
Pros
Cons
Best for: You want a boxed 3 mm and 6 mm air starter kit and you will oil it.
Less suitable: Quiet work, small hobby tanks, or buyers who need a printed air-consumption figure.
Specifications
Common questions
Does it come with a case?
Yes. The bullets and UK reviews describe a compact carrying case with the 16-piece kit.
Which collets are supplied?
3 mm and 6 mm collets are stated.
Is the air use printed?
No. Operating pressure and air consumption are not on the amazon.co.uk table. UK reviews still describe a 50 L tank running out quickly.
The Yosoo Health Gear kit is the lowest shelf price in this set at about £16.69, with 23,000 rpm and 3 mm and 6 mm in the title. The title prints 90 psi. Air consumption is not stated. The amazon.co.uk line is 4.3 from 32 reviews, a small sample. UK text calls it handy and noisy. It fits a first air pencil if you already know your compressor can feed an unstated air demand. Skip it if you need a named brand or a printed air-use figure.
Pros
Cons
Best for: A first cheap straight air pencil when you already have hearing protection and a compressor.
Less suitable: Anyone who needs printed air consumption, a large UK review sample, or quiet running.
Specifications
Common questions
What pressure does the listing name?
The title prints 90 psi. Air consumption in CFM or L/min is not on the capture.
Which collets does it take?
The title prints 3 mm and 6 mm. A full box list is not stated.
Is this a straight or angle tool?
The title is a straight mini grinder. amazon.co.uk ranks it under Angle Grinders.
The QWORK 90-degree kit at about £25.99 is the row that prints 6 CFM at 6 bar, but it is a 12,000 rpm 2 inch disc sander, not a 25,000 rpm burr pencil. The bullets name a 1/4 inch inlet. The amazon.co.uk line is 3.6 from 63 reviews. UK text includes air leaks that stop the spindle, first-use internal failure, and a lever that does not start the tool under pressure. It fits you only if you specifically want a cheap 2 inch pad and will accept that review pattern. Skip it if you need a 6 mm collet tool or a stronger UK reliability sample.
Pros
Cons
Best for: You want a 2 inch 90-degree air pad and you will treat the 3.6 sample as a risk.
Less suitable: Buyers who need a 6 mm burr tool near 25,000 rpm, or a cleaner UK review file.
Specifications
Common questions
How much air does the listing claim?
The bullets print 6 CFM at 6 bar with a 1/4 inch inlet. That is listing text, not a measured free-air test.
Is this a 6 mm burr pencil?
No. The listing is a 12,000 rpm 90-degree tool with 2 inch sand discs, ranked under Angle Grinders.
What do UK reviews say about reliability?
UK lines include air leaks that stop the spindle, first-use internal failure, and a lever that does not start the tool under pressure. The amazon.co.uk average is 3.6 from 63 reviews.
The LengSuaa body-only cordless straight grinder is about £39.99 with four printed speeds from 8,000 to 26,000 rpm and five 6 mm bits. There is no Customer Reviews line on the capture, so the amazon rating is not stated. The title says DeWalt 18 V and the bullets name Makita 18 V packs. Do not treat that contradiction as a dual fit. A charger is not stated. It fits you only if you will verify the battery mount yourself against packs you already own. Skip it if you need a confirmed platform or a UK review sample.
Pros
Cons
Best for: You will check the battery mount in person and already own matching packs.
Less suitable: Anyone who needs a stated platform, a charger, or amazon.co.uk review evidence.
Specifications
Common questions
Is a battery included?
No. The title states no battery. A charger is not stated on the capture.
Which battery platform does it fit?
The capture contradicts itself. The title says DeWalt 18 V and the bullets name Makita 18 V packs. Do not assume either until the mount matches a pack you own.
What speed range is printed?
Four adjustable speeds from 8,000 to 26,000 rpm.
Eight amazon.co.uk listings were scored from the stored pages and the UK review themes already on file. Shelf date 21 October 2026. There is no laboratory test. Stars are the listing line. A missing air-consumption figure is not filled in. A 5.0 from two reviews is not scored like a 4.6 from 73. The highest score is the top pick. The best price against a large review file among the cheaper air kits is the best value. One of each. The weights below sum to 100.
Amazon evidence
30%Stars divided by 5, times 30, then rounded. No review line scores 0. One to nine reviews are capped. Ten to 49 reviews lose a slice of the star figure. Fifty to 149 lose a smaller slice. One hundred and fifty or more keep the star figure.
Listing fit
35%Points for a clear body, a stated collet, free speed in a burr band, printed air use or a complete battery kit, a safety lock, and honest extras. A missing air-use line scores nothing on that slot. A title and bullets that name different battery platforms score nothing on the battery slot.
Review outcome
20%UK review themes that name a job, a failure or a limit score above a star average alone. Two reviews cannot fill this band. A thin captured sample does not score like a file that names steel, air hunger or a replaced part.
Value
15%Shelf price in GBP against what the listing actually states and how deep the review file is. The lowest price does not win this band on its own if the review sample is small or the air figure is missing.
Match the collet, the head and the power source before you read a star line. 3 mm, 6 mm and 1/4 inch are different shanks. Tank litres are not free-air delivery. Two five-star reviews are not a durability claim.
A die grinder is a compact rotary tool. The collet grips a shanked burr, a mounted stone, a drum or a small disc, and the free speed is high compared with a drill. You use it on welds, ports, seams and rust where a large disc will not fit. On the listings in this set, a suitable tool has a collet that matches 3 mm, 6 mm or 1/4 inch (6.35 mm), a head that fits the job, and either enough free air or a battery platform you can name. 6 mm and 1/4 inch are not the same collet. 1/4 inch is 6.35 mm.
A 50 L hobby tank can run out while the tool is still cutting. UK reviews in this set say that. A printed psi figure is not a free-air delivery test.
1/4 inch is 6.35 mm. A 6 mm collet will not hold a 1/4 inch shank properly. Check the box list, not the title alone.
A 5.0 from two reviews is capped in this score. It is not the same evidence as 4.6 from 73 or 4.4 from 254.
Air tools in this set are the straight pencils and the 90-degree kits. They need free air at about 90 psi (6 bar). The WORKPRO listing prints 85.5 L/min. The QWORK listing prints 6 CFM at 6 bar. The other air rows print 90 psi only, or they print no air figure at all. Do not fill that gap from the size of the tank. Oil the air tool. A missing oil bottle on one row does not mean the tool can run dry. Cordless rows split in two.
A straight body reaches into a port or along a weld. A right-angle head reaches a wheel arch and a face, and it is the shape that carries a 2 inch disc in this set. Match the stated free speed to the accessory. 12,000 rpm with sanding discs is a different machine from 20,000–26,000 rpm with a burr. Do not use either as a drill. Then read the sample size. 4.6 from 290 and 4.4 from 254 are usable files. 4.3 from 32 is a smaller one. 5.0 from 2 is not a durability claim.
Three typical situations, each with a recommendation from this comparison.
You already have enough free air and you want a straight 3 mm and 6 mm pencil. The WORKPRO WG803 is the top pick at about £21.99, with 25,000 rpm and 85.5 L/min printed, at 4.6 from 73 reviews. UK reviews flag a coarse throttle and high air use.
You want a case, stones and both collets, and you will oil the tool. The ORAZIO / Katsu 212505B kit is best value at about £16.99, at 4.4 from 254 reviews. Air consumption is not on the table, and UK reviews call it noisy.
You want a right-angle body and a complete kit. The YEARTOP 12 V kit is about £59.99, with two packs, a UK 3-pin charger and a 1/4 inch collet. The amazon.co.uk line is 5.0 from 2 reviews, which is not a durability claim.
The top pick is the WORKPRO WG803 at about £21.99: a straight air pencil, 25,000 rpm, 3 mm and 6 mm collets, and 85.5 L/min at 90 psi printed, at 4.6 from 73 reviews. UK reviews mention a coarse throttle, high air use, and one tool that stopped after two months. Best value is the ORAZIO / Katsu 212505B case kit at about £16.99, at 4.4 from 254 reviews, with air consumption not on the table. The Anesty kit has the largest review sample, at 4.6 from 290, and no printed CFM. The QWORK row is a 12,000 rpm disc pad with a 3.6 line. The YEARTOP 5.0 is from two reviews. The LengSuaa title says DeWalt and the bullets name Makita packs. None of these scores is a laboratory test.
ORAZIO / Katsu 212505B
About £16.99 for a 16-piece case with 3 mm and 6 mm collets, at 4.4 from 254 reviews. Air use is not printed.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources from the research digest, used for this page in October 2026. Prices, stars and review counts are from the eight amazon.co.uk listings captured on 21 October 2026. HSE noise, vibration and PUWER apply at work. They are not a certificate for a hobby tool. A printed CFM or L/min figure is listing text, not a measured free-air test.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are from the listings. This is not a laboratory test.
