QUICK ADJUST Allows for Infinite Valve Timing Adjustability of +/-6 Degrees to Tune for Maximum Engine Performance Output. Two Piece Camshaft Sprocket Design Featuring 6 Locking Cap Screws for Maximum Clamp Load. Includes an Accessory Adjustment Tool. Both Billet Steel Sprockets are Heat Treated for Durability. TRUE Roller 0.250" Roller Diameter Chain for Reduced Friction. Includes Captured Needle Camshaft Sprocket Thrust Bearing to Minimize Block Thrust Surface Friction. 3-Piece Sets Hand-Match. 0.005" and 0.010" Reduced Center Distance Sets Available, to Order Add -5 or -10 to the End of this Part Number.