Feature:
This couplers are made of stainless steel, they are used for RC boat to connect the motor with the drive shaft.

Multiple specifications and sizes can be selected:
3.17mm motor shaft to 4mm Flexible shaft,
4mm motor shaft to 4mm Flexible shaft,
5mm motor shaft to 4mm Flexible shaft,
6mm motor shaft to 4mm Flexible shaft,

Description:
Material: stainless steel
Made by CNC, it strong and durable
Size:3.17mm / 4mm / 5mm /6mm(Optional)

Package included:
1 x Flexible Coupling
1 x Grub Screw

Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3mm.