Cobra offers this self-propelled lawn mower that is powered by petrol, which makes the engine more powerful than other models. The minimum cutting height is 25 millimeter.
From Lawn Mowers
Cobra MX534SPH Self-Propelled 4 Speed Mower (Honda Engine)
Garden Machinery Superstore
Cobra MX534SPCE 21" 4-in-1 4 Speed Self-Propelled Electric Start Lawnmower
This product is also available at 6 unverified merchants.