Applications: · Alters motors with a different diameter shaft · 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. · Adapts larger wheel bores to smaller axels · Works with Gas Engine Crank Shafts to enlarge the crank diameter to fit pulleys, gear boxes etc. Part's specification: · Sleeve inside diameter 3/4” · Sleeve outside diameter 7/8" · Sleeve length is about 3” · Sleeve Keyway slot 3/16” · Keystock Length is about 2”