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. 

Specifications:

outer diameter：16mm
length：25mm
screw：M4*4 Meter screws（use 2mm internal hexagonal wrench）
size：6-12mm
weighta: bout 8g