Stihl Petrol Grass Trimmer FS 40FS 40 Petrol Grass Trimmer. For trimming small areas of grass and lawn edges. Simple starting system, multi function controls, round handle, 2 MIX engine. With bent shaft, loop handle and AutoCut mowing head ideally for trimming small areas of grass and around obstacles. Extend your domestic warranty from 2 to 3 years with the purchase of 5 litres of STIHL MotoMix fuel and this product. Your STIHL Approved Dealer will register your extended warranty