Carpet knife buying guide
Updated: October 2026
You are about to pay for a carpet knife on amazon.co.uk, and the title may be describing three different tools. A carpet knife buying guide has to settle the blade mount, whether the blade really retracts, whether a holster covers a fixed tip, and whether any blades are in the box. Colour is the easy part to see and the weak part to trust. The six listings, with prices and review counts, sit on the [carpet knife comparison](/hub/cutting-tools/carpet-knife). Peter F. checked those amazon.co.uk lines on 19 October 2026. This page is the checks before you pay, not a ranking.
You are about to pay for a carpet knife on amazon.co.uk, and the title may be describing three different tools.
You are about to pay for a carpet knife on amazon.co.uk, and the title may be describing three different tools. A carpet knife buying guide has to settle the blade mount, whether the blade really retracts, whether a holster covers a fixed tip, and whether any blades are in the box. Colour is the easy part to see and the weak part to trust. The six listings, with prices and review counts, sit on the carpet knife comparison. Peter F. checked those amazon.co.uk lines on 19 October 2026. This page is the checks before you pay, not a ranking.
Our top picks
| Badge | Product | Knife type | Blade change | Holster | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  TradeUnderlay TradeUnderlay orange carpet fitter knife | Fitter knife with holster | Thumb screw, no extra tools | Yes | 8.0 | about £12.99 | View offer |
| Alternative |  STANLEY Stanley FatMax heavy duty trade knife FMHT10501-0 | Fixed trade knife | Quick-release thumb wheel | n/a | 5.0 | about £17.52 | View offer |
| Best value |  LuLuxinxin LuLuxinxin sprung-arm carpet cutter | Sprung-arm cutter | Single screw | n/a | 5.4 | about £4.99 | View offer |
On this page
Three bodies, not one knife
Fitters usually mean a dolphin-style knife: a curved handle, a fixed blade clamped by a thumb wheel or thumb screw, spare blades inside the handle, and a belt holster. The TradeUnderlay orange, green, and yellow listings copy the same bullets at £12.99 each. They are one design in three colours, sold under TradeUnderlay or CCA, and they are not the original Janser or Reddig dolphin.
The second body is a heavy fixed trade knife: the Stanley FatMax FMHT10501-0, non-retractable, with a coarse-thread thumb wheel and storage claimed for 10 blades, at £17.52. It is not a dolphin.
The third body is a flat sprung-arm cutter. Both £4.99 listings are about 220 mm long and 140 g, with an SK5 blade and a single screw. Neither states a holster.
Five checks before you pay
Start with the blade mount. A UK review of the £4.99 sprung-arm cutter B0GMWP8B3Z said notched Stanley-style blades would not fit and that a blade with a hole seemed to be required. If the listing does not name a blade code, test one blade before a 10-pack. The profile is a separate pack, on hook blade for carpet.
Then check fixed against retractable on the knife. Trade dolphin knives are fixed blades in a holster. The TradeUnderlay style field says retractable, and a UK reviewer of the orange knife wrote that the blade does not. The yellow listing says retractable and non-retractable at once.
The holster is a safety check. HSE says not to carry a knife in a pocket, and to use a sheath if it travels. One UK review of the orange knife said the holster was loose and the blade could stick out of the bottom. The £4.99 cutters and the FatMax include line do not mention a holster.
Storage is not blades supplied. The £12.99 handles open for spares. The FatMax claims storage for 10 blades. Their include lines name a holster or the knife, not a blade. Stanley’s UK page for FMHT10501-0 lists two blades, a 1996 hook, and a sheath. Keep that list apart from the Amazon line.
What these listings actually state
The orange knife is the top pick for a holstered fitter shape if you check the sheath. Reviewers describe a quick blade change and say it takes Stanley-style blades. The limits are in those reviews: no spare blade in the box, a holster that can leave the tip exposed, and one report that the blade does not retract.
Green and yellow share the £12.99 bullets. Green’s six UK notes include paint that flaked, a magnet that fell out on day two, and a hinge pin that came out. Yellow’s notes say it holds Stanley-type blades.
The FatMax has one positive UK review and a thin record. The LuLuxinxin £4.99 cutter is the best value for a low-stakes trial, with one review that says it stuck. The other £4.99 cutter has one review, and that reviewer never had carpet to cut.
Which body to pay for
Pay for the orange fitter knife if you will check the sheath. Pay for the FatMax if you have read that this Amazon line is the knife, not the manufacturer kit. Pay about £5 only for a trial you can abandon. A qualifying purchase through the comparison links can earn a commission at no extra cost to you.
Common questions
Are blades in the box?
Often they are not. Read the include line for the seller you are paying. The orange, green, and yellow lines list a holster. The FatMax Amazon line lists the knife. Stanley’s UK product page lists two blades, a 1996 hook, and a sheath, which is a different source. One yellow-knife reviewer said a blade was included. The listing itself does not confirm that.
Will ordinary Stanley blades fit?
Some reviewers say the orange and yellow fitter knives take Stanley-style blades. That is not a code printed in the specification table. The £4.99 cutter B0GMWP8B3Z drew the opposite note: notched blades appeared not to fit, and a blade with a hole seemed to be required. Buy one blade and try the mount before you buy a pack.
Is a dolphin knife retractable?
The trade dolphin is a fixed blade in a holster. The TradeUnderlay style field says retractable, and a UK reviewer of the orange knife wrote that the blade does not retract. The yellow listing says both retractable and non-retractable. Treat those words as a conflict until you have the knife in your hand.
Are the orange, green, and yellow knives different tools?
They share the same £12.99 bullets: thumb screw, spare storage, holster, and the same named materials. The handles differ on the listings, ABS, metal, or rubber, and the UK notes differ. Green has paint, magnet, and pin complaints in a sample of six. Yellow has a title complaint and a contradictory handle field. Orange has the largest review file and the holster-fit complaint.
Is a £5 sprung-arm cutter the same shape?
No. It is a flat cutter with sprung arms and a single screw, about 220 mm long, without a stated holster or a spare store. It can be a cheap trial, which is why one of them is the best value in this set, and it is a different tool from a dolphin knife you wear on a belt all day.
Related pages
Sources
Public UK sources and amazon.co.uk listing lines; retrieved 19 October 2026.
- HSE, Hand knives (retrieved 19 October 2026)
- GOV.UK, Buying and carrying knives (retrieved 19 October 2026)
- Criminal Justice Act 1988 section 141A (retrieved 19 October 2026)
- Consumer Rights Act 2015 (retrieved 19 October 2026)
- Stanley Tools UK, FMHT10501-0 (retrieved 19 October 2026)
- Screwfix, Stanley FatMax FMHT10501-0 (retrieved 19 October 2026)
- Ulster Carpets retailer fitting guide (retrieved 19 October 2026)