3mm to 4mm Bore Rigid Coupling, 20mm Length 9mm Diameter, Copper Shaft Coupler Connector Brass Tone 4Pcs

Description:
Made of high-strength copper with integrated structure, maintenance-free, oil proof and corrosion resistance.
Top tight type rigid coupling, high torque with rigidity, low inertia and excellent sensitivity.
No rotation gap, elastic action can make up for symmetrical angular misalignment.
Suitable for model car, model boat, hardware, mold, mechanical drive situations, etc.