Description: 100% Brand new,never been used Professional installation in highly recommended(No instruction included) Water Pump Pulley: Double Grooves Pulley Diameter is 6 9/16" Pulley is 3" Tall Bolt Pattern is 2 1/8" Center hole is 5/8" Belt Type: V-Belt Machined From Billet Aluminium These Feature deep grooves to prevent belt from slipping .