Hexagonal Brass Coupling 30mm - SriTu Hobby

Hexagonal side length is 7mm,, Diagonal distance is 13.6mm,, Side to side is 12mm,

Hexagonal Brass Shaft Coupling Motor Transmission Connector

Hose & Suction Adapters - Elkhart Brass

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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

Wheels Archives - SriTu Hobby

Electronic kits Archives - SriTu Hobby

Brass Hexagon Motor Flexible Coupling RC Small DIY Car Shaft Coupler P – LittoHot

Hexagonal Brass Shaft Coupling Motor Transmission Connector - SriTu Hobby

Steel Pipe Fitting - Hex Union, Brass, Male, Threaded, MISUMI