Features:This steel shaft sleeve adapts a crankshaft from 5/8 inch to 3/4 inch diameter, it comes with 3/16 inch keystock.Alters motors with a different diameter shaft and 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 axles, works with Gas Engine Crank Shafts to enlarge the crank diameter to fit pulleys, gear boxes etc.One adapter and keystock included; Made from cold rolled steel, CNC precision machined and tumbled, high durability.Specification:Condition: 100% Brand NewItem Name: 5/8 inch to 3/4 inch Crank Shaft Sleeve AdapterMaterial: SteelColor: SilverSleeve Inside Diameter: 5/8 inchSleeve Outside Diameter 3/4 inchSleeve Length: about 3 inchSleeve Keyway Slot: 3/16 inchPackage Weight: approx.60gPackage List:1 * 5/8 inch to 3/4 inch Crank Shaft Sleeve Adapter1 * Keystock