BORDSTRACT Hex Coupler, 5Pcs 30mm Lengthen Brass Coupling Brass Motor Connector Accessories with Hex Wrench and Screws for RC Motor Car Wheels Tires(8mm) : Industrial & Scientific
SriTu Hobby (@sritu_hobby) en Threads
Hexagonal side length is 7mm,, Diagonal distance is 13.6mm,, Side to side is 12mm,
Hexagonal Brass Shaft Coupling Motor Transmission Connector