New 5 x 5mm CNC Motor Jaw Shaft Coupler 5mm To 5mm Flexible Coupling # 07 Brand new and high quality. Shaft coupler Often used to connect servo motor, stepper motor, encoder, screw driving, machine platform, etc. Shaft:5mm X 5mm. Length:25mm. Diameter:20mm. Material: Aluminium. Size:2cm x 2cm x 2.5cm -0.79inch x 0.79inch x 0.98inch.