Item Type: M4 Flanged Lock Nut Set Material: Aluminum Alloy + Iron Weight: Approx.25g/0.9oz Diameter of the Wheel Hex Adapter : Approx. 12mm/0.5in Wheel Hex Adapter Thickness: Approx. 7mm/0.3in Non-slip Nut Aperture: Approx. 4mm/0.2in Compatibility: Suitable for Traxxas / Axial / Hsp / Redcat / Tamiya / Hpi RC Cars. 1Made of aluminum alloy and iron materials, environmentally friendly, strong and durable. 2High quality, accurate size, with fixing screw, easy to install and replace. Suitable for Traxxas / Axial / Hsp / Redcat / Tamiya / Hpi RC cars. 3Wheel hub adapter can reduce the clearance position and combine with the wheel more closely. The wider design can increase the wheel base. 4High accuracy, easy to use and operate, improve the overall performance of your model car. 5Excellent workmanship, very suitable for your remote control car, the replacement of remote control car accessories. 1 xCross Wrench 4 xWheel Hex Adapter 4 x Non-slip Nut 4 x Pin 1. Please allow 0?1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.