Size: Adapter sleeve, 5/8" ID to 1" OD, 3/16" x 1/4" x 3/4" keystock
Material: Made of metal material, better protect the crank and for long time use
Features: Allow the use of a 1" torque converter or clutch on the minibikes and other engines with 5/8" crankshaft, reduces the necessity of buying a new motor or pulley to maintain existing components and speed/ power requirements
Function: Works with gas engine crank shafts to enlarge the crank diameter to fit pulleys, gear boxes etc