Description: This steel shaft sleeve adapts a crankshaft from 1" to 1-1/8" diameter. It comes with 1/4" stepkey. Alters motors with a different diameter shaft Alters pulleys for a different speed or belt Reduces the necessity of buying a new motor or pulley to maintain existing components and speed/power requirements. Adapts larger wheel bores to smaller axels Works with Gas Engine Crank Shafts to enlarge the crank diameter to fit pulleys, gear boxes etc. Specification: Sleeve inside diameter: 1 inch Sleeve outside diameter: 1-1/8 inch Sleeve length: 3 inch Sleeve Keyway slot: 1/4 inch Step Key Length: 2 inch Package Includes: 1 x Shaft Sleeve Adapter Kit