The Duster is the best clutch for snowmobiles and other machines using belt driven torque converter drive systems. Simple in construction, simple to install and simple to calibrate. The Duster costs less than most clutches and will out perform clutches costing twice as much. Fits all engines, regardless of belt top width or crankshaft size. The Duster, by Comet. Each Duster comes complete with mounting bolt and cover bolt.