Features 1、100% Brand New 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 new engine, you may need to use a small hammer to gently tap it in to place for tightly fit. Specifications: Features: 100% Brand New 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 new 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 New Item Name: 7/8 inch to 1 inch Crank Shaft Sleeve Adapter Material: Steel Color: Silver Adapter Size(L*Dia): 7.6 * 2.5cm/3 * 1in Step Key Length: 5.2cm/2.1in Package Weight: approx.82g Package List: 1 * 7/8 inch to 1 inch Crank Shaft Sleeve Adapter 1 * Step Key Package List