for 1" to 1-1/8 inch 1/4" Key Gas Engine Pulley Crank Shaft Sleeve Adapter Predator This steel shaft sleeve adapts a crankshaft from 1” to 1-1/8” diameter. It comes with 1/4“ stepkey. Applications: 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. Part's specification: Sleeve inside diameter 1” Sleeve outside diameter 1-1/8” Sleeve length is about 3” Sleeve Keyway slot 1/4” Step Key Length is about 2” The sleeve and step key are designed to slip fit on your 1” diameter crankshaft with 1/4” keyway and enlarge it to 1-1/8 diameter with 1/4” keyway.