The Hex Brass Coupling is a compact and lightweight wheel coupling designed for use with the 130mm Robot Wheel for All Terrain and DIY Robotics. Made from durable brass, it provides a secure mechanical connection between compatible shafts and wheels. It features an 18.05mm total length, 12mm edge width, and 8.1mm bore diameter, with an approximate weight of 9g. Ideal for DIY robots, robot cars, all-terrain vehicles, and custom wheel mechanisms. Images are for representation only; the actual product may vary slightly in appearance.