Specifications: Condition: 100% Brand New Material: Steel Color: Silver As Shown Inside diameter: 7/8in Outside diameter: 1in Length: approx. 3in Keyway Slot: 1/4in Step Key Length: approx. 2in A steel shaft adapter to convert a crankshaft from 7/8 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. A very handy way to use your old pulley on a new engine. 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. Works with Gas Engine Crank Shafts to enlarge the crank diameter to fit pulleys, gear boxes etc. Package Included: 1 x Sleeve Adapter 1 x Step Key