Trimmer Head vs Brush Blade: Which One Should You Buy?
Trimmer heads and brush blades compared on fit, arbor, pack contents and shaft type, with one line head and two blades from the listings.
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Top picks at a glance
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- 1
Husqvarna 130L Gas String Trimmer9.6/10View on Amazon - 2
Wild Badger Power 52cc 2-Cycle Weed Wacker String Trimmer9.6/10View on Amazon - 3
DocSmart Cordless Hedge Trimmer with 2 Batteries9.4/10View on Amazon - 4
5 Pack Weed Eater Head for Echo Speed Feed 400 SRM-225View on Amazon - 5
Nakkaa Trimmer Head Compatible with SRM-225 SRM-230View on Amazon - 6
Nayciiy 511010601 Trimmer Head Compatible with Redmax PT-104View on Amazon - 7
Echo 99944200907b New Genuine Speed Feed 400 Head fits AllView on Amazon - 8
String Trimmer Head SRM-225 FOR Echo Speed Feed 400 HeadView on Amazon - 9
25-2 Bump Feed Trimmer Head 4002 710 2108 for Stihl FS55View on Amazon
Verdict: Choose a trimmer head if your work is grass and soft weeds and you want a speed feed head with lines included for Echo or Shindaiwa straight shaft trimmers. Choose a brush blade if you cut branches, brush and shrubs and your straight shaft gas trimmer takes a 1-inch arbor blade, or your Stihl model is on the brush knife list.
A property edge after a wet spring shows the choice plainly: soft grass along a fence, then woody stems where the field meets the ditch. The trimmer head vs brush blade question comes down to line against metal. This comparison covers the differences, then the examples from the listings, using only what each listing states.
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Kohnkdllc 2 Pack 9-Inch 20T Carbon Steel Brush Cutter Blade
A 2-pack of 9-inch 20-tooth carbon steel brush cutter blades with two adapter kits and a round file.
Who it's for: owners of gas straight shaft trimmers who cut branches, brush and shrubs and want adapters in the box.
Who should skip it: anyone with a lithium battery machine, since the listing states it does not fit most of those.
Read the full review
The Kohnkdllc example is a 2-pack of 9-inch 20-tooth blades in carbon steel, described as manganese steel, with two adapter kits and a round file for straight shaft gas trimmers with a 1-inch arbor. The listing states it does not fit most lithium battery machines, and it recommends hard shoes or long jeans plus safety glasses or goggles when working.
Pros
- 2 blades plus 2 adapter kits and a round file
- 9-inch 20-tooth blade for branches, brush and shrubs
- Adapter kits for Stihl and straight shaft 1-inch arbor
- Heat and rust resistance stated for the steel
Cons
- Does not fit most lithium battery machines
- Weight is stated for the kit as sold, not per blade
- No warranty term is stated
- Adapter size must be checked against the machine
VIABRICO 5 Pack Speed Feed Trimmer Head for Echo SRM-225
A speed feed trimmer head for Echo and Shindaiwa straight shaft trimmers, with trimmer lines included.
Who it's for: owners of Echo or Shindaiwa straight shaft trimmers who want a speed feed head with lines included.
Who should skip it: anyone with a curved shaft trimmer, since the listing states straight shaft only.
Read the full review
The VIABRICO example is a speed feed head for Echo SRM and PAS models and Shindaiwa straight shaft trimmers, with a 3-3/4-inch diameter, an M10 x 1.25 mm bolt size and a maximum rotation speed of 10,000 RPM. Its title says 5-pack while the spec table lists 3 items, so the pack count is stated two ways, and the listing states no adapters are included and curved shaft trimmers do not fit.
Pros
- Fits many Echo and Shindaiwa straight shaft models
- Lines included at 6.56 ft
- Line change without disassembly stated
- Takes line sizes from 0.080 to 0.130 inches
Cons
- Title says 5-pack, spec table lists 3 items
- No adapters included
- Straight shaft only, not curved shaft
- No warranty term is stated
Stihl 4112 713 4100 25.4 mm Brush Knife Steel Blade
A genuine Stihl OEM brush knife blade with a 25.4 mm mounting hole for listed Stihl brushcutters.
Who it's for: owners of listed Stihl brushcutters who want a genuine OEM blade.
Who should skip it: anyone whose model is not on the compatibility list, since no other fit is stated.
Read the full review
The Stihl example is a genuine OEM brush knife with a 25.4 mm mounting hole, compatible with a long list of Stihl FS, FSA and KM models. Its spec table lists a weight of 0.1 pounds, which cannot describe a steel brush knife, so no weight is given for it here, and no blade diameter is stated.
Pros
- Genuine Stihl OEM factory part
- Fits a long list of Stihl FS, FSA and KM models
- 25.4 mm mounting hole clearly stated
- Steel brush knife for brushcutting
Cons
- No blade diameter is stated
- Spec table weight of 0.1 pounds is not usable
- No warranty term is stated
- No adapters or files included
Other machines to compare
5 Pack Weed Eater Head for Echo Speed Feed 400 SRM-225Check price on Amazon
Nakkaa Trimmer Head Compatible with SRM-225 SRM-230Check price on Amazon
Nayciiy 511010601 Trimmer Head Compatible with Redmax PT-104Check price on Amazon
Echo 99944200907b New Genuine Speed Feed 400 Head fits AllCheck price on Amazon
String Trimmer Head SRM-225 FOR Echo Speed Feed 400 HeadCheck price on Amazon
25-2 Bump Feed Trimmer Head 4002 710 2108 for Stihl FS55Check price on Amazon
Trimmer head vs brush blade side by side
| Factor | Trimmer head example | Brush blade examples | Notes |
|---|---|---|---|
| Cutting tool | Speed feed head with trimmer line | 9-inch 20-tooth blade; Stihl brush knife | Line head vs metal blade |
| Fit | Echo SRM/PAS and Shindaiwa straight shaft | Straight shaft gas trimmers, 1-inch arbor; Stihl FS/FSA/KM list | Each listing names its own fit |
| Shaft type | Straight shaft only, not curved | Kohnkdllc straight shaft only; Stihl by model list | Check fit against the model lists |
| Pack contents | 5-pack per title; lines included | 2 blades, 2 adapter kits, 1 file; Stihl blade only | Kit contents differ by listing |
| Weight | 1.6 lb | Kohnkdllc kit 3.2407952514 lb; Stihl figure not usable | See reviews for the weight figures |
| Warranty | Not stated | Not stated | No listing states a warranty term |
| Safety gear noted | Not stated | Kohnkdllc listing recommends glasses, hard shoes | Only the Kohnkdllc listing notes gear |
Figures are manufacturer stated for the three example models, collected 2 November 2026.
Line or blade: what each head cuts
A trimmer head spins line, and the VIABRICO example takes line sizes from 0.080 to 0.130 inches, with lines included at 6.56 feet. A brush blade spins metal, and the Kohnkdllc example lists a 9-inch 20-tooth blade for branches, brush and shrubs. The Stihl example is a steel brush knife for Stihl brushcutters on its model list. Line suits grass work, while a blade suits woody growth, and the listings draw that line by what each head is sold to cut.
Fit: models, arbors and shaft type
Fit is where the listings differ most. The VIABRICO head fits Echo SRM and PAS straight shaft models and Shindaiwa straight shaft models named in the listing, with an M10 x 1.25 mm bolt size, and it states no adapters are included and curved shaft trimmers do not fit. The Kohnkdllc blade fits most gas trimmers with a straight shaft and a 9-inch by 1-inch arbor, with adapter kits for Stihl trimmers and for straight shaft trimmers, and it states it does not fit most lithium battery machines. The Stihl blade fits the Stihl FS, FSA and KM models on its list, with a 25.4 mm mounting hole, so check the list for your model before ordering.
Pack contents and upkeep
The boxes hold different things. The VIABRICO title says 5-pack while its spec table lists 3 items, so the pack count is stated two ways, and its lines are included with line change without disassembly. The Kohnkdllc kit holds two blades, two adapter kits and one round file. The Stihl listing names a single blade part, with no adapters or files stated. For upkeep, the line head needs fresh line through its holes, while the blade kit includes a file for the blades.
Weight and warranty: what the listings leave unclear
Weight and warranty are the thin spots here. The VIABRICO spec table lists 1.6 pounds. The Kohnkdllc spec table lists 3.2407952514 pounds for the kit as sold, which is usable as a kit weight. The Stihl spec table lists 0.1 pounds, which cannot describe a steel brush knife, so no weight is given for the Stihl blade here. No listing here states a warranty term, so warranty coverage should not be assumed for any of the three.
The three examples
Acreage and terrain fit
VIABRICO Trimmer Head
Kohnkdllc 9in Blade
Stihl Brush Knife
The Acre Score explained
The Acre Score weighs five factors: performance (what each head cuts and its fit range), build quality (materials and construction), value (what comes in the box), safety (certifications or operator controls the listing states) and warranty (years and coverage). A factor the listing does not state scores zero, which is why all three examples score zero for safety and for warranty.
| Product | Acre Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Kohnkdllc 9in Blade | 9.5 | 30 | 21 | 22 | 0 | 0 |
| VIABRICO Trimmer Head | 9.5 | 29 | 20 | 21 | 0 | 0 |
| Stihl Brush Knife | 9.4 | 28 | 21 | 18 | 0 | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.
If you want a string trimmer shortlist, see our battery string trimmer for tall grass picks.
Wear eye and hearing protection, long pants and sturdy footwear, and keep bystanders well back while the line or blade spins. Clear stones and debris first, and stop the engine or remove the battery before clearing the head. Refuel only with the engine off and cool. See OSHA landscaping safety. Read our Safety Disclaimer.
FAQ: mowing large lots
Can a trimmer head cut brush?
The listings here do not say that. The VIABRICO head is a line head for grass trimming, while the Kohnkdllc blade listing states it cuts branches, brush and shrubs.
Will the VIABRICO head fit my trimmer?
It fits Echo SRM and PAS straight shaft models and Shindaiwa straight shaft models named in the listing, with an M10 x 1.25 mm bolt size and no adapters included. It does not fit curved shaft trimmers.
Will the brush blades fit a battery trimmer?
The Kohnkdllc listing states it does not fit most lithium battery machines. The Stihl blade fits the models on its list, including FSA135 and FSA200, so check the list for your model.
What comes with the Kohnkdllc kit?
Two 9-inch 20-tooth blades, two adapter kits and one round file, per the listing.
Is there a warranty on these heads and blades?
None of the three listings states a warranty term, so warranty coverage should not be assumed for any of them.
