3/4" to 1" Inch w/Step Key Gas Engine Pulley Crank Shaft Sleeve Adapter PredatorThis steel shaft sleeve adapts a crankshaft from 3 4" to 1" diameter. It comes with step key that offsets from 3 16 to 1 4. 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