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Sydien 2pcs 6 to 6mm CNC Shaft Coupling Flexible Coupler Motor Connector,D19xL25mm: Amazon.com: Industrial & Scientific
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KFidFran 4mm to 4mm Bore Rigid Coupling, 20mm Length 9mm Diameter, Copper Shaft Coupler Connector, Brass Tone 2Pcs( Starre Kupplung mit 4 mm bis 4 mm Bohrung, 20 mm Lテ、nge 9 mm