Precision machined billet aluminum. Includes bushing to fit both large (3/4 ) and small (5/8 ) pilot shaft Compatible with Chevy water pumps. Five sizes available: 1 , 1-1/2 , 2 , 2-1/2 and 3 . Bolts included. Lightweight billet 6061-T6 aluminum construction. Anodized black. Note: This adapter contains two bolt patterns for both the long style and short style Compatible with Chevy water pumps: 2-5/32 and 1-3/4 . This billet aluminum fan spacer allows you to properly position your fan for maximum air flow Comes with an adapter sleeve to work with 5/8 or 3/4 water pump pilot and 5/8 fan pilot size Dual bolt patterns accommodate center to center spacing of 1-3/4 to 2-5/32 and fits nearly all Compatible with V8 engines Comes complete with hardware to simplify installation Available in 1 , 1-1/2 , 2 , 2-1/2 and 3 lengths Brand Speedway Motors Model Speedway Motors Exterior Anodized Position Center Item Weight 1 pounds Manufacturer Speedway Motors Item model number 91015730-1.50 Product Dimensions 1 x 1 x 1 inches Manufacturer Part Number 91015730-1.50