Best SDS max drill bit: which listing fits the hole
Updated: 2026-10-23
You are comparing five SDS max masonry bits on amazon.co.uk. There is no single best SDS max drill bit in this set. The highest star line is not a British sample of that size, and four UK Drills sizes share one review pool. Match the hole on the fixing sheet, then decide whether any of these five is the honest buy. Prices are on the [SDS max drill bit comparison](/hub/drilling-and-accessories/sds-max-drill-bit). Shank, diameter and length, in that order, stay on the [SDS max drill bit buying guide](/hub/drilling-and-accessories/sds-max-drill-bit/sub/sds-max-drill-bit-buying-guide).
You are comparing five SDS max masonry bits on amazon.co.uk. There is no single best SDS max drill bit in this set.
You are comparing five SDS max masonry bits on amazon.co.uk. There is no single best SDS max drill bit in this set. The highest star line is not a British sample of that size, and four UK Drills sizes share one review pool. Match the hole on the fixing sheet, then decide whether any of these five is the honest buy. Prices are on the SDS max drill bit comparison. Shank, diameter and length, in that order, stay on the SDS max drill bit buying guide.
Our top picks
| Badge | Product | Diameter | Stated length | Tip | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Keewaki Keewaki 20 x 400 mm | 20 mm | Title 400 mm; one bullet 340 mm | 4-cutter cross tip | 6.8 | about £17.99 | View offer |
| Best value |  UK Drills UK Drills 18 x 330 mm | 18 mm | 330 mm; working length not split | 4-cutter, taper point, 118 degrees | 5.6 | about £14.89 | View offer |
| Alternative |  UK Drills UK Drills 10 x 280 mm | 10 mm | 280 mm; working length not split | 4-cutter cross head | 5.6 | about £9.99 | View offer |
On this page
Why the star lines do not pick a winner
Keewaki B0GVMJM9HP shows 4.8 from 53 reviews, at £17.99. Those reviews are a US file, and they mostly describe other sizes. They are not a UK report on this 20 mm bit. Stars without the diameter you need are a sort order, not a test.
The four UK Drills listings each show 4.1 from 233 reviews, and the text is the same pool. B01N410BGL at £9.99, B01N8S4VO9 at £14.89, B01MXLCTNH at £15.99 and B01MQJ434H at £26.99 are not four separate tests. The four files also share one image, so the photograph does not prove which length is in the parcel. Judge the bullet that states the diameter and the length you can read.
Which kept listing fits which hole
B01N410BGL at £9.99 is 10 × 280 mm. The shank is still SDS max, about 18 mm, so skip it if the hammer is SDS plus or the sheet asks for more than 10 mm.
B01N8S4VO9 at £14.89 is 18 × 330 mm, and the only UK Drills row here with a taper point and 118 degrees. That is a tip description, not a life test. B01MXLCTNH at £15.99 is the same diameter with a 400 mm title and no separate working length. The 330 mm title is the closer match for a modest depth.
B0GVMJM9HP at £17.99 is the only 20 mm bit. The title says 400 mm, a bullet says 340 mm, and a highlight says 400 mm working depth. Do not merge that clash into one depth. B01MQJ434H at £26.99 is 25 × 550 mm and the only polished finish in the set. If your sheet is 12 mm, 16 mm or 22 mm, skip all five.
When a catalogue bit is the different buy
£10 to £27 is a clearance-hole budget for a stated diameter, not a trade bit that prints working length beside total length. Bosch, DeWalt and a Power Tool World shop listing publish that second column. Those prices are not a test of these five ASINs, and DeWalt's 540 mm product length does not repair the clash on B0GVMJM9HP.
Choose a catalogue bit when you need a diameter this set does not stock, or a printed working length. Stay inside the five when the sheet says 10, 18, 20 or 25 mm and you accept weak stars, a shared review pool, and no PGM mark. What reinforced concrete does not promise is on the SDS max drill bit for reinforced concrete page.
How these listings were checked
The Products Compared editorial team used the amazon.co.uk prices and star lines, plus the Bosch Professional GB, DeWalt UK and Power Tool World pages as catalogue or shop contrasts. We did not run a lab test, and we did not treat the shared 233 reviews as four results. A qualifying purchase through our links can earn a commission at no extra cost to you. Updated 22 October 2026.
Common questions
Which of these five should I buy?
Buy the listing whose cutting diameter is the diameter on the fixing sheet, and only if the hammer is already SDS max. That is £9.99 for a 10 mm hole, £14.89 or £15.99 for 18 mm, £17.99 for 20 mm, and £26.99 for 25 mm. There is no single best bit across those sizes.
Is the 4.8 Keewaki the best because the stars are higher?
No. The 4.8 from 53 is a US-written review file, and most of those reviews describe other sizes. They are not a UK sample of this 20 mm bit. UK Drills shows 4.1 from 233 on every size because the four ASINs share one pool, not because each size was tested 233 times. Use Keewaki when you need the only 20 mm listing and you can live with the length clash.
Why do all the UK Drills sizes show 233 reviews?
Amazon has attached the same review text to B01N410BGL, B01N8S4VO9, B01MXLCTNH and B01MQJ434H. One pool can mention a diameter you are not buying, including a return about a shank that would not fit. Read a review when it names the diameter and length in your basket.
Is £9.99 the best value?
It is the lowest price in the set, and it is not best value as a verdict on the reviews. Those 233 reviews are the shared UK Drills pool, not a test of the 10 × 280 mm bit on its own. The bit is only a candidate when you need a 10 mm hole and the chuck is SDS max.
When is a Bosch or DeWalt catalogue bit the honest buy instead?
When you need a diameter these five do not list, or a page that states working length and total length separately. Bosch's GB EXPERT page prices a 12 mm bit, 200 mm working and 340 mm total, at £75.82 including VAT. DeWalt UK states 400 mm working and 540 mm overall on the 20 mm DT9417-QZ. Power Tool World's £20.95 Bosch 18 × 200 × 340 mm is a shop listing, not these ASINs.
Related pages
Sources
Public UK and manufacturer pages used for shank, dust, vibration and anchor-bit geometry, plus the amazon.co.uk listings for the five ASINs. Last checked on 22 October 2026.
- Heller Tools, Shanks (retrieved 22 October 2026)
- HSE CN3, Construction dust: drilling (retrieved 22 October 2026)
- HSE CIS36, Construction dust (retrieved 22 October 2026)
- HSE, Hand-arm vibration: assess the risks (retrieved 22 October 2026)
- HSE INDG175, Hand-arm vibration (retrieved 22 October 2026)
- HSE, Electrical systems on construction sites (retrieved 22 October 2026)
- Bosch Professional GB, PRO SDS max-7 drill bit (retrieved 22 October 2026)
- PGM, Check of standard drill bits (retrieved 22 October 2026)
- PGM, Marking of drill bits (retrieved 22 October 2026)