Billet Crankshaft Sprocket Has Three Keyways for +/- 4 Degrees Adjustability. Both Sprockets are Heat Treated for Durability. Premium Half Inch Pitch Single Roller Chain for Reduced Friction. 3-Piece Sets Hand-Matched to Qualify the Correct Center Distance and Minimize Runout. Model # 9-3157 Item Dimensions: 7. 5" L x 7. 5" W x 2" H.
