Stihl HS 56 Hedge Trimmer Double-Sided 24" Bar 21.4cc EngineStihl HS 56 Hedge Trimmer Double Sided 24" Bar 21. 4cc Engine The ergonomic design and reduced emission technology make the HS 56 hedge trimmer user friendly and environmentally responsible. Fuel efficiency offers longer run times while this hedge trimmer features an optimized gearbox, providing long machine life even in heavy use. A blade tip guard helps prevent damage to the blade and gearbox and makes it easier to trim low growing ground cover