Description: 100% Brand New Items, Never Used Or Installed Professional Installation is Highly Recommended No Instruction Included 2 Groove Water Pump Pulley Finish: Natural Material: Aluminum Grooves: Double The pulley diameter is 6 9/16". The pulley is 2 3/4" tall. The bolt pattern is 2 3/4". The center hole is 1 1/8". These Feature deep grooves to prevent belt from slipping. 1 Groove Water Pump Pulley Finish: Polished .