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Einhell GC-HM 300 review

A 13 to 37 mm range on five steel blades, with a plastic roller behind the cylinder and a park position for storage.

The bottom line The only machine on this shelf with a roller stated — a 45 mm plastic one — which is what steadies a cylinder mower over uneven ground and puts the stripe in a lawn. Slightly the widest range here at 13 to 37 mm, a 16-litre removable box, and a park position for standing it in a shed.

What the maker prints on its own page

A robust motorless mower for lawns up to 150 m², allowing quiet mowing without electricity or fuel. The ball-bearing cutting cylinder carries five steel blades at a 30 cm cutting width. The cutting height adjusts in four steps from 13 to 37 mm. A 45 mm plastic roller and the wheels give even guidance. The 16-litre grass box is removable and easy to empty. The handle is curved for ergonomics and a park position allows safe, simple storage.

The roller, and why it is the feature

Three of the four machines on this shelf say nothing about a roller. This one gives its material and its diameter.

A roller behind the cylinder carries weight, which does two things. It steadies the machine over ground that is not perfectly flat, so the cylinder holds its height instead of dipping into every hollow and scalping every rise. And it lays the cut grass over in the direction of travel, which is where a striped lawn comes from.

Plastic at 45 mm is a light roller. A heavy steel one does more of both, and costs more and weighs more.

The lowest setting on the site

13 mm. Nothing else on this entire site cuts that short.

That is a fine-turf height and it belongs on a fine-turf lawn: level, fed, watered and cut two or three times a week. Applied to an ordinary mixed lawn it takes most of the leaf off and opens the sward to whatever moves in.

What a park position is

A way of standing the machine upright and stable for storage, rather than leaning it against a wall where it falls over. On a shelf where the machines are light and awkwardly shaped, it is a genuinely useful thing to have designed in.

Availability

From 60 € to 80 €, that being the spread across the German, French, Italian and Spanish Amazon stores on the day of the survey.

Beyond the euro zone, the American and British Amazon stores price it in their own currencies, which the spread above sets aside.

Taken from Keepa on the day this page was last revised; stock and prices move without notice.

Prices quoted in this text were read on 26 September 2026. The live price is at the top of the page.

The declared figures, and the point they stop at

Strengths

  • A roller, stated with its diameter — the only one on this shelf that gives either
  • The widest height range here, and the lowest setting at 13 mm
  • A park position, so the machine stands rather than leans

Compromises

  • A plastic roller rather than a steel one, which is lighter and less effective at flattening
  • No weight published
  • Read in all six markets with a wide spread, so the price depends heavily on where you are

Specifications

Cutting width30 cm, as stated
Blades5 steel blades on a ball-bearing cylinder
Cutting heights13–37 mm in 4 steps
Stated areaUp to 150 m², as stated by the maker
Catcher volume16 L, removable
RollerPlastic, Ø 45 mm, as stated
WeightNot published
Amazon referenceB08L3SY819 (one reference across 6 Amazon marketplaces)
EAN4006825651942

What this machine usually gets asked

What does the roller do?

It rides behind the cylinder and carries part of the machine’s weight, which steadies the cut over slight unevenness and lays the grass over in one direction — the stripe. A mower without one follows the ground more closely and scalps high spots more readily.

Is 13 mm usable?

On a fine, level, frequently cut lawn, yes, and that is exactly the lawn a cylinder mower belongs on. On an ordinary domestic lawn it scalps every high spot and removes the leaf the grass feeds itself with.

Does it need electricity or fuel?

Neither. That is the whole proposition: no charging, no stale petrol, no cable, no noise figure to worry about, and nothing to service but the blades.

Who this one is for

A small lawn kept short, where a light stripe and a steady cut are the point

Guides that feature it

Price and availability

A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.

Details checked on September 26, 2026.

Sources

Specifications: manufacturer sheet and Amazon product page. Prices and availability: Keepa. No product on this site has been physically tested.

How we assess products