ITEM NAME:1" to 1-1/8" Crankshaft Sleeve Adapter Bushing Converter Pulley Bore Reducer Description: Alters pulleys for a different speed or belt Alters motors with a different diameter shaft Adapts larger wheel bores to smaller axels Reduces the necessity of buying a new motor or pulley to maintain existing components and speed/power requirements. Works with Gas Engine Crank Shafts to enlarge the crank diameter to fit pulleys, gear boxes etc. Specification: Sleeve inside diameter 1inch Sleeve outside diameter 1-1/8inch Sleeve length is about 3inch Sleeve Keyway slot 1/4inch Step Key Length is about 2inch Material: stainless steel Size Chart: Size:76x30mm Package Includes: 1x 1 inch to 1 1/8 shaft adapter Note: The color may have different as the difference display, pls understand. Please allow 1-3mm error due to hand test. Thank you for your understanding and finding this item. Enjoy your shopping timeï ¼ .Adapts larger wheel bores to smaller axels. Size Chart.