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Ring spanner set: pairs, offset and profile

Updated: 24 October 2026

A ring spanner set is the roll you pick up when a nut has to turn without an open jaw chewing two flats, and the title rarely says which pairs, which bend, or which profile are inside. The gap shows up when the fastener is 19 mm and recessed, while your largest ring stops at 17 mm. Read the printed pairs, then the head, then the ring shape. The [ring spanner comparison](/hub/hand-tools/ring-spanner) ranks the amazon.co.uk listings we kept. Peter F. compiled these notes on 22 October 2026 from those listings and public UK sources, not a lab test. A qualifying purchase can earn us a commission at no extra cost to you.

A ring spanner set is the roll you pick up when a nut has to turn without an open jaw chewing two flats, and the title rarely says which pairs, which bend, or which profile are inside.

Our top picks

US PRO US PRO 7-piece 35° swan neck

Best overall

US PRO US PRO 7-piece 35° swan neck
7.4/10about £14.20
View offer
BGS BGS 12-piece offset ring set

Rank 2

BGS BGS 12-piece offset ring set
7.9/10about £30.46
View offer
Silverline Silverline 6-piece deep offset set

Best value

Silverline Silverline 6-piece deep offset set
7.3/10about £5.95
View offer
On this page
  1. 1.Read the pairs, not the range
  2. 2.Offset, flat, or slotted
  3. 3.12-point, hex, and E-Torx
  4. 4.What DIN 838 and ISO 10104 do not prove
  5. 5.What to ignore on the listing

Read the pairs, not the range

A metric ring spanner set is a list of double-ended pairs, not a span on the sleeve. The full run in this folder is 6×7, 8×9, 10×11, 12×13, 14×15, 16×17, 18×19, 20×22, 21×23, 24×27, 25×28 and 30×32 mm. Only the BGS 1214 listing on amazon.co.uk prints all twelve, at £30.46. Cromwell's Kennedy 11-piece omits 25×28 mm. Silverline 673424, the £5.95 six-piece here, stops at 16×17 mm. Silverline 627185 is a different twelve-piece at other UK shops, not that amazon.co.uk listing. Skip lines for named sets are on best ring spanner sets.

Offset, flat, or slotted

The same pairs do three jobs, and the head decides which. An offset or swan-neck ring lifts your knuckles and lets the loop sit on a nut down a recess. The only degrees printed in this folder are 75° on the US PRO 3528, 35° on the US PRO 2984, and 15° on the BGS open ring at 24×27 mm. Deep offset on Silverline 673424 and BGS 1214 is not one of those numbers. A GOV.UK tool sheet uses deep offset for a bend of about 0 to 5 degrees, so the shop phrase is not a single shape. A straight extra-flat ring, the BGS 30300 at £28.02, is the opposite: the crank hits the panel, and the flat head does not. A slotted ring is the third tool, for a nut a closed loop cannot pass, such as a brake-pipe union.
US PRO US PRO 7-piece 35° swan neck

Testsieger

US PRO US PRO 7-piece 35° swan neck
7.4/10about £14.20
View offer

12-point, hex, and E-Torx

Profile is what the ring grips once it is seated. A 12-point ring reseats every 15 degrees. That is not permission to use a loose size, because the extra corners then slip. Only the BGS listings here print 12-point. The Hilka eight-piece field says Hex and does not say 6-point or 12-point, so do not invent a point count. The US PRO six-piece titled E6 to E24, at £12.62, will not fit a millimetre hex nut, and the pairs are not printed. For ordinary hex nuts, an E-Torx set is a second tool.

What DIN 838 and ISO 10104 do not prove

DIN 838 on a listing is a claim about form and marking, not a strength certificate and not a test we ran. In this folder it is printed on the BGS 1214 bullets, and not on the short sets or the extra-flat BGS 30300. ISO 10104:2018, in the public preview, covers outside dimensions and marking. It is not a torque test, and it is not a certificate for these ASINs. If you already own combination spanners, read ring spanner vs combination spanner before you add a second roll.

What to ignore on the listing

Two amazon.co.uk fields copy a number that is not the bar. Item length on BGS 1214 says 32 mm, the largest jaw, not the length in your hand. On US PRO 2984 the field repeats 160 mm, only the 6×7 pair, while the bullets print bars up to 246 mm. Hilka shows 150 Nm and US PRO 3528 shows 75 Nm. The 75 in that title is the offset in degrees. Neither bullet describes a torque test, so neither figure is a safe load. A close metric ring on an inch nut will round it.

Common questions

What pairs should a metric ring set include?
Count the pairs on the listing, not a span such as 6-32 mm. A set can claim a wide range and still omit 25×28, or stop at 16×17 mm as Silverline 673424 does. If the nut is 19 mm or 22 mm, a six-piece roll is the wrong buy however wide the title sounds.
Is chrome vanadium enough?
Chrome vanadium is the steel name on most of these listings. It does not say which pairs are in the roll, whether the head is offset, or whether the ring is 12-point, hex or external Torx. Buy the printed pairs and the head. Treat the alloy as a label, not the specification.
What does DIN 838 tell me?
DIN 838, where a listing prints it, points at the form of a double ring spanner. It is not a torque figure, and we did not check the tools against the standard. ISO 10104:2018 covers outside dimensions and marking, not a strength certificate for the ASIN in the basket.
Is a 12-point ring better than a hex ring?
A 12-point ring reseats every 15 degrees, so you can catch the nut when the swing is short. It is the worse choice if the size is loose, because the extra corners slip. The Hilka field says Hex and stops there. External Torx is not a hex ring with different numbers.
Why does the length match the jaw size?
On several listings the item-length field copies the largest size in the title. BGS 1214 shows 32 mm and Silverline 673424 shows 17 mm. That is the jaw, not the bar. Ignore a length that is identical to a jaw.
Do I need imperial rings as well?
You need imperial rings when the nut is imperial. A metric set does not include them, and a near size will round the flats. Older British cars and some machines still use inch fasteners. Read the nut before you pull. A closed ring will not start on a brake pipe.

Related pages

How to use a ring spanner

Ring spanner

Best ring spanner set: full list, short roll or flat

Offset ring spanner: 35 degrees, 75 degrees, or flat

Ring spanner vs combination spanner for your drawer

Sources

Sources from the research digest, last checked on 22 October 2026.

  1. ISO 10104:2018 preview (retrieved 22.10.2026)
  2. HSE, PUWER overview (retrieved 22.10.2026)
  3. HSE, maintenance of work equipment (retrieved 22.10.2026)
  4. Consumer Rights Act 2015, section 9 (retrieved 22.10.2026)
  5. Haynes UK, car maintenance tools (retrieved 22.10.2026)
  6. BGS 1214 double ring spanner set (retrieved 22.10.2026)
  7. Wonkee Donkee, flare nut spanner (retrieved 22.10.2026)
  8. GOV.UK tool specification sheet (retrieved 22.10.2026)