Billet Aluminum ConstructionMounts to the Stock Harmonic Balancer Bolt Holes Supports up to 5 PulleysIncludes a Fixed Position 5" Pulley for AlternatorsIncludes Adjustable 3" Pulley to Drive Vacuum Pumps1 12" Diameter Pulley ShaftGrade 8 Hardware IncludedMany Other Pulleys To Choose From100% Made in U.S.A.