This is a ALUMINUM Pulley Nose cover. This Pulley Nose Cover provides a clean, custom look When deleting the flex or clutch fan. Matched with my Aluminum LONG water pump pulleys Comes with aluminum nose cap,(4) 5/16-24 allen bolts 2.125" Bolt Pattern Center to Center 5/8" Pilot Center Hole Will Not Fit Vette or Pre 1973 Chevy / GMC Trucks Will NOT work with steel pulley's