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Material: high-quality aluminum alloy material, surface colorful oxidation processing, corrosion resistance; surface color: blue; suitable temperature range: -80℃~+300℃. Specifications: Shaft hole size: 7-8mm; Locking screw: M4; Outer diameter: 14mm; Length: 25mm. Packing: 4 rigid couplings (including locking screws); 1 free hexagonal locking wrench is included. Performance: Transmission efficiency: 99.86%; large load torque, low noise and wear. Scope of application: 3D printers, motor drive systems, DIY encoders, stepping motors, lifting platforms, screw drives, CNC machine tools, etc.