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Description: This steel shaft sleeve adapts a crankshaft from 3/4"to 7/8" diameter. It comes with 2.01" step key. 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 axles Works with Gas Engine Crank Shafts to enlarge the crank diameter to fit pulleys, gear boxes etc. Specification: Material: Stainless Steel Color: Silver Tone Sleeve inside diameter: 19mm / 0.75" Sleeve outside diameter: 22mm / 0.87" Sleeve length: 76mm / 2.99" Step Key Length: 51mm / 2.01" Sleeve Size: 76x22mm / 2.99"x0.87" (LxMax.D) Package Includes 1 Set Shaft Sleeve Adapter Kit