Widely used in drive systems for encoders, instrumentation,lead screws, small pumps, feed rollers and anywhere light to medium duty, torsionally flexible coupling is required., 1., Total Size: 25 x 19mm / 0., 98 inch x 0., 75 inch (L*D); Feature: Set screws , 2., Connection Diameter: 5mm to 10mm , 3., Material: Aluminum alloy; Net Weight: 90g , 4., Package Content: 5 x Shaft coupling , 5., Main Color: Silver Tone Aazon.co: Sydien 2Pcs 5 to 10 otor Shaft Coupling Aluinu Alloy Aluminum Alloy Zero Backlash Shaft Coupler For Motor 5-10mm Promo Aluminium Alloy Shaft Coupler Motor Flexsibel Coupling Join Connector 5x10mm Aluminum Alloy Spring Coupling 5mm To 10mm Bore 5 Pack The coupling shaft is made of 45# steel, suitable for connecting servo motor, stepper motor, encoder, screw driving, machine platform, etc. Are there any... Absorption of parallel, angular misalignments and shaft end-play by spring action. Material: Aluminum alloy; Connection Diameter: 5mm to 9mm; Total Length: 25mm /0.98 inch; Outside Diameter Zero backlash.