* Note: Each coupling will be supplied with four machine screws, and each order will be supplied with a wrench.
* Overall dimensions: diameter at both ends of the cross section is 8.7mm, diameter at the middle of the cross section is 7.3mm, and total length is 20mm.
* Screw hole: M3
* The brass coupling is a through-hole that connects two optical shafts with different diameters, can also connect a motor to an optical shaft, or connect shafts with different diameters. It can be used as a screw rod or as a transmission between the power propeller shaft and the motor of a model remote control ship.