Material: Aluminum alloy; Connection Diameter: 10mm to 10mm; Total Length: 25mm /0.98 inch; Outside Diameter: 19mm/ 0.75 inch Zero backlash. One-piece metallic spring coupling. For little torque shaft connect. Absorption of parallel, angular misalignments and shaft end-play by spring action. 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. Package Content: 1 x Shaft coupling