Description:This steel shaft sleeve adapts a crankshaft from 3/4" to 1" diameter. It comes with 1.77"" step key.Alters motors with a different diameter shaftAlters pulleys for a different speed or beltReduces the necessity of buying a new motor or pulley to maintain existing components and speed/power requirements.Adapts larger wheel bores to smaller axlesWorks with Gas Engine Crank Shafts to enlarge the crank diameter to fit pulleys, gear boxes etc.Specification:Material: Stainless SteelColor: Silver ToneSleeve Inside Diameter: 19mm / 0.75"Sleeve Outside Diameter: 25mm / 0.98"Sleeve Length: 58mm / 2.28"Sleeve Keyway slot: 4.7mm / 0.19"Step Key Length: 45mm / 1.77"Sleeve Size: 58x25mm / 2.28"x0.98" (LxMax.D)Package Includes1 Set Shaft Sleeve Adapter Kit.