6mm to 12mm Aluminum Alloy Coupling
This Aluminum Alloy Coupling can be used on CNC machines, 3D printers, car models, RC metal model, etc. This coupler is simply designed with easy buffering, damping, and convenient connection and disconnection properties. This coupling is completely sized and has a smooth surface.
screw：M4*4 Meter screws（use 2mm internal hexagonal wrench）
weighta: bout 8g