Usage Tips:Features: 1.100% Brand 7/8 inch to 1 inch Crank Sleeve Adapter with Step Key. 2.Made from cold rolled steel, CNC precision machined and tumbled, high durability. 3.It is used to convert a crankshaft from 7/8 inch to 1 inch shaft. 4.The adapter is approximately 3 inches long and includes the step key needed to go from the 1/4 in key way to the 3/16 key way. 5.Allows you to use your old clutch or pulley on a engine, you may need to use a small hammer to gently tap it in to place for tightly fit.Specification:Features:100% Brand 7/8 inch to 1 inch Crank Sleeve Adapter with Step Key. Made from cold rolled steel, CNC precision machined and tumbled, high durability. It is used to convert a crankshaft from 7/8 inch to 1 inch shaft. The adapter is approximately 3 inches long and includes the step key needed to go from the 1/4 in key way to the 3/16 key way. Allows you to use your old clutch or pulley on a engine, you may need to use a small hammer to gently tap it in to place for tightly fit. One adapter and keyway included, the wider portion of the key sits in the adapter. Specification:Condition: 100% Brand Item Name: 7/8 inch to 1 inch Crank Shaft Sleeve AdapterMaterial: SteelColor: SilverAdapter Size(L*Dia): 7.6 * 2.5cm/3 * 1inStep Key Length: 5.2cm/2.1inPackage Weight: approx.82gPackage List:1 * 7/8 inch to 1 inch Crank Shaft Sleeve Adapter1 * Step KeyPackageList: