Accessories and Parts -Extended Hex Hub Adapter Highlights Generic Brand Extended Hex Hub Adapter Description: Perfect design, exquisite workmanship and high performance. Lightweight and portable to carry, high quality and durability in use. Made of high quality metal and easy to install on your RC car The coupler increases stability, cornering speed and brake efficiency of the vehicle. Specially designed for 1/10 Traxxas Hsp Redcat Rc4wd Axial scx10 D90 Hpi RC Car Crawler. specification: Material: metal Color: black Hub opening: 5mm/0.20inch Axle screw: 4mm/0.16inch Hex: about 12mm/0.47inch Weight: 2.6g/piece Package includes: 4pcs 12mm Hex Coupler 4pcs 12mm Hex 15mm Coupler Note: Please allow 1-3mm measurement deviation due to manual measurement. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color shown on the pictures.Thanks!