2pcs 3x4mm CNC Motor Jaw Shaft Coupler 3mm To 4mm Flexible Coupling OD 19x25mm Go to amazon.com Related posts How to buy the best cnc 3 mm? FeatureBrand new& High quality. Description2pcs 3x4mm CNC Motor Jaw Shaft Coupler 3mm To 4mm Flexible Coupling OD 19x25mm