The cobra s390h is a petrol engined hand propelled scarifier suited for medium to large size lawn areas. With a petrol model you have the freedom to work any where without the draw back of cables and leads. Lawn scarifiers help to clear moss and weeds which can take hold and allow the lawn and ground to become matted. With a scarifier the hard surface is cut which allows the grass roots to breathe and take in essential extra nutrients including oxygen and water. When the lawn is dry mow the area first, to a height of about an inch then use the scarifier. It is recommended that after scarifying you immediately use a fertiliser for a nice green lawn. The cobra s390h has a 38cm working width and the machine is fitted with a quality gp 160 engine. Complete with a 45 litre fabric collector. The working height can be adjusted with a central lever from 0 10mm.specificationsengine honda gp160drive no, hand propelledfuel unleaded petrolworking width 38cmblades 16 hardened metalheight adjuster centralgrass bag capacity 45 litreswheel size front rear 20cm 8 weight 30kgwarranty 2 years domestic