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Best strimmer line for the diameter you already know

Updated: October 2026

You know the diameter the head will take, and you want one amazon.co.uk row to open rather than twelve. The best strimmer line in this set is not a single winner. Shelf prices run from £2.99 to £12.99, two pairs of listings share review text, and a line that is right for a 2.4 mm round eyelet is the wrong cord for a 1.5 mm domestic head. The [trimmer line comparison](/hub/lawn-and-garden-equipment/trimmer-line) holds the full table. This page says which row is the first click once the size is known, and who should leave it. Our links can earn a commission.

You know the diameter the head will take, and you want one amazon.co.uk row to open rather than twelve. The best strimmer line in this set is not a single winner.

Our top picks

Dapetz Dapetz 1.5 mm x 20 m

Best overall

Dapetz Dapetz 1.5 mm x 20 m
8.6/10about £2.99
View offer
Oregon Oregon 2.4 mm x 15 m round

Rank 2

Oregon Oregon 2.4 mm x 15 m round
9.0/10about £5.99
View offer
Zeqeey Zeqeey 1.6 mm x 100 m

Alternative

Zeqeey Zeqeey 1.6 mm x 100 m
7.6/10about £10.99
View offer
On this page
  1. 1.No single winner in this set
  2. 2.Top pick when the head is marked 2.4 mm and takes round
  3. 3.Best value when the head takes 1.5 mm
  4. 4.Who should open a different row

No single winner in this set

Shared stars are the reason a league table would be false. Both SOL packs print model 700151SOL and overlapping reviews, so 4.4 from about 2,560 ratings does not compare 1.6 mm with 2.0 mm. Both Viabrico reels share long UK paragraphs, including a 380 m length that matches neither reel, so 4.6 from about 7,300 ratings does not compare the two square diameters. Navoys prints 2.4 mm in the title and 1.65 mm in a bullet, so it is not a cheap stand-in for a named 2.4 mm coil. The first click is the row whose one printed size matches the head. Millimetre bands, if you still need them, are on the diameter page.

Top pick when the head is marked 2.4 mm and takes round

If the head is marked 2.4 mm and the eyelet takes round line, the top pick is the Oregon donut, part 69-362-OR. It is round nylon, 2.4 mm by 15 m, at £5.99. The amazon.co.uk line is 4.3 from 14,156 ratings. UK reviews mention the dispensing eyelet, and they also report snapping beyond short grass. Skip this donut for a 1.5 mm or 2.0 mm head, and for a Bosch AFS 23-37.
Dapetz Dapetz 1.5 mm x 20 m

Testsieger

Dapetz Dapetz 1.5 mm x 20 m
8.6/10about £2.99
View offer

Best value when the head takes 1.5 mm

If the head takes 1.5 mm round line and 20 m is enough, the best value row is Dapetz at £2.99. This variant is round red nylon, 1.5 mm by 20 m, wound onto the spool you already have. It has 4.4 from 389 ratings, a sample that is not shared with the SOL or Viabrico pools. One UK review found it stiff, so it sprang off the spool. The title also names 1.2 mm, 1.6 mm, 2 mm, 2.4 mm and 3.0 mm, so confirm the basket is this 1.5 mm by 20 m choice. Twenty metres will not last a heavy season, and it is the wrong coil if the head is marked 2.4 mm.

Who should open a different row

A 1.6 mm head you wind yourself is not looking at Oregon or at Dapetz. Zeqeey is £10.99 for 100 m titled 1.6 mm, with 1.65 mm also printed. The SOL 1.6 mm twin is £5.99, prints no shape, and shares its stars with the 2 mm pack. Square line is the Viabrico reels, only if the manual allows that profile and that diameter. KINGTAIXIN is £2.99 and prints no diameter. An AFS 23-37 takes pre-cut strands: DRERIO is 25 lengths of 37 cm by 3.5 mm at £8.99.

Common questions

Is there one best strimmer line for every head?
No. The head’s diameter and the format decide the row. A 2.4 mm round donut, a 1.5 mm short coil, a named cassette and a 37 cm strand are different objects. Shared stars are not a single winner.
Which row is the first click when the head is marked 2.4 mm and takes round line?
Oregon part 69-362-OR, 2.4 mm by 15 m, at £5.99. It is the traceable short coil in this set, with 4.3 from 14,156 ratings. Leave it if the manual wants square line, if the head is marked under 2.4 mm, or if you need a season’s length in one pack.
Which row is the best value when the head takes 1.5 mm and you only need a short refill?
Dapetz, this 1.5 mm by 20 m round variant, at £2.99, with 4.4 from 389 ratings. Confirm the variant, because the title lists other diameters. It is the wrong coil if the head is marked 2.4 mm.
Why do the SOL and Viabrico star counts not pick a winner?
The two SOL listings share model 700151SOL and overlapping review text, so 4.4 from about 2,560 ratings is one pool, not a duel between 1.6 mm and 2.0 mm. The two Viabrico listings share long reviews, so 4.6 from about 7,300 ratings does not show that 2.0 mm square lasts longer than 2.4 mm square.
Who should skip the Oregon 15 m donut?
Skip it for a 1.5 mm to 2.0 mm domestic head, for an AFS 23-37, and for a head that the manual limits to square line. Also skip it if you need more than 15 m before the next order, because UK reviews that report snapping will use that length quickly.
Is a 100 m reel better value than a 15 m donut?
Per metre, yes, after the diameter is right. A 100 m reel at about £11 is more line than a £5.99 donut of 15 m, and it is worse value if the eyelet will not take it. Zeqeey’s 100 m still prints both 1.6 mm and 1.65 mm. Stars are buyer scores, not a timed wear test.

Related pages

Trimmer line buying guide

Trimmer line

How to wind strimmer line on a standard bump spool

Round or square strimmer line for a domestic eyelet

What size strimmer line do I need for this machine

Sources

Sources checked for this comparison; last retrieved on 17 October 2026.

  1. HSE, chain-flail bulletin for brush cutters (retrieved 17 October 2026)
  2. HSE INDG480, hand-arm vibration (retrieved 17 October 2026)
  3. GOV.UK, outdoor noise regulations 2001 (retrieved 17 October 2026)
  4. ISO 11806-1:2022, brushcutters and grass trimmers (retrieved 17 October 2026)
  5. STIHL GB safety manual for FS machines (retrieved 17 October 2026)
  6. STIHL UK, AutoCut 2-2 mowing head (retrieved 17 October 2026)
  7. Yourspares, how to choose strimmer line (retrieved 17 October 2026)
  8. Consumer Rights Act 2015, section 22 (retrieved 17 October 2026)
  9. Bosch DIY, extra-strong line 37 cm x 3.5 mm (retrieved 17 October 2026)