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uxcell 4mm to 8mm Bore Rigid Coupling Set Screw L25XD14 Aluminum Alloy,Shaft Coupler Connector,Motor Accessories,Blue,2pcs: Amazon.com: Industrial & Scientific
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4mm, 10mm, 20mm Micro Size Stepper Gear Motor Planetary Gearbox with Metal Shaft 3V, 9V, 12V 24V DC for Robot Joint - China Gear Motor and Geared Motor
4mm, 10mm, 20mm Micro Size Stepper Gear Motor Planetary Gearbox with Metal Shaft 3V, 9V, 12V 24V DC for Robot Joint - China Gear Motor and Geared Motor
Pololu Multi-Hub Wheel w/Inserts for 3mm and 4mm Shafts - 80×10mm, White, 2-Pack
Rigid Couplings Shaft Coupling 4 mm to 4 mm Inner Diameter L20xD12 Robot Motor Wheel Rigid Coupler Connector Red gaby-fey.com
100 x 20 mm Robot Track Wheel for 6mm Shaft
