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Description: This steel shaft sleeve adapts a crankshaft from 3/4" to 1" diameter. It comes with 1.77"" 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: 25mm / 0.98" Sleeve Length: 58mm / 2.28" Sleeve Keyway slot: 4.7mm / 0.19" Step Key Length: 45mm / 1.77" Sleeve Size: 58x25mm / 2.28"x0.98" (LxMax.D) Package Includes 1 Set Shaft Sleeve Adapter Kit