Features: This steel shaft sleeve adapts a crankshaft from 1” to 1-1/8” diameter. It comes with 1/4“ stepkey. Part’s specification: Sleeve inside diameter 1” Sleeve outside diameter 1-1/8” Sleeve length is about 2.3” Sleeve Keyway slot 1/4” Step for Key Length is about 1.8”. The sleeve and step for key are designed to slip fit on your 1” diameter crankshaft with 1/4” keyway and enlarge it to 1-1/8 diameter with 1/4” keyway. 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 fits. One adapter and keyway included, the wider portion of the for key sits in the adapter. Specifications: Material:Stainless Steel Sleeve inside diameter 1” Sleeve outside diameter 1-1/8” Sleeve length is about 2.3” Sleeve Keyway slot 1/4” Step for Key Length is about 1.8” Net Weight:73g Package Includes: 1x Crankshaft Sleeve Adapter note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.