M10-5mm/6mm/6.35mm/8mm/10mm/12mm/14mm Motor Shaft Coupler Sleeve Saw Blade Coupling
Shaft Sleeve 1/4Inch(6.35mm) Shaft Motor to 11mm Bore Adapter for RV030 Worm Gear Speed Reduce: Amazon.com: Industrial & Scientific
NEMA 23 motor accessories shaft sleeve hole adapter for worm gear variable speed motors 6.35 to 11mm / 8 to 11mm
Motor Shaft Coupler Sleeve Saw Blade Connecting Rod Coupling Saw Chuck Adapter | eBay
Amazon.com: 3mirrors Crank Shaft Adapter Stainless Steel Crank Shaft Sleeve Adapter 3/4" to 1" Inch w/Step Key for Gas Engine Pulley Crank Shaft Predator Pulley : Automotive
Amazon.com: Steel 3.175mm (1/8 inch) to 5mm Pinion Reducer Sleeve Adapter Shaft Motor Axle Change-Over for Converting RC Motor 3650 550 540 Pinion Gears, Set of 3 : Toys & Games