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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. Specification: Color: Silver Tone Net Weight: 18g Material: Aluminum alloy Connection Diameter: 5mm to 8mm/0.2 inch to 0.31 inch Total Length: 25mm /0.98 inch Outside Diameter : 20mm/ 0.79 inch Package Content: 1 x Shaft coupling