Cobra RM46SPC Roller Rotary Petrol Lawnmower. With exceptional performance, strong build and good looks, this Premium Cobra RM46SPC 18 petrol lawnmower is powered by Cobra OHV easy start 4 stroke engine and is Self Propelled for ease of use.. With its rear roller for a classic.And the ability to cut. Adjustment via a single lever height adjuster, this model has 6 different settings 7mm through to 75mm. Quick release handlles fold down easily for storage. A strong robust steel cutting deck ensures years of mowing. Cobra Lawnmowers are expertly designed in the UK to cater specifically for the changing conditions of the British Lawn. Cobra RM46SPC Premium Petrol Lawnmower. V 4 Stroke Easy Start Engine. Cutting Width: 46cm / 18. Cutting Height: 17 - 75mm 7 Stage Adjustment.