Simple design and outstanding durability. Easy to install and calibrate. A few plastic pucks and a spring control all the operating characteristics. Comes with a mounting bolt and cover puller bolt. Features orange spring. 3100 RPM engagement. For use with 1-3/8" belt width. Specifically for Polaris “long” crankshafts that extend into the clutch approx. 2”; 72 to present. Crankshaft PTO size is sometimes referred to as 32 mm to distinguish it from standard 30 mm PTO shafts which extend into the clutch bore approximately 1-1/4”. The 1:10 taper is the same, however. Clutch diameter is 7-1/4”, which is smaller than the Polaris-built models it replaces.. Negative (-) numbers indicate the taper begins in an extension out of the fixed face casting..