High-quality material: The universal connection nut is made of superb alloy steel material, which is strong and . CNC mechanical design: 4mm motor coupler has a , ideally suited workmanship, precise size, convenient and brief installation and disassembly. 360-degree rotatable universal joint: This mm joint rely can substitute the transmission course at any point, which is very bendy and straightforward to use. Application: 4 mm rotation coupling is optimal for remote control mannequin vehicles and handheld remote control model boats, as well as supreme motor shaft meeting accessories. Material:alloy metallic colour:Silver Package Contents: four x Cardan Coupling Connector eight x screws 2 x Wrench Only the above kit content, different products aren't included. Note: Light and diverse exhibits can cause the color of the item in the photograph a little varied from the genuine thing. The measurement allowed error is +/- 1-3cm.