Feature:1. EXCELLENT MATERIAL: RC hex coupler is made of premium aluminum alloy. Durable and resistant to wear and tear. High strength and sophisticated appearance.2. HEX DESIGN: 12mm/0.47in to 17mm/0.67in wheel hex coupler with hex design to prevent axles from falling off.3. PRACTICAL ACCESSORIES: RC wheel hex hub allows you to mount 1/8 scale wheels into 1/10 scale wheels.4. EASY TO INSTALL: The RC wheel hex hub is easy to install and remove, allowing direct replacement of original plastic parts or damaged parts.5. PERFECTLY COMPATIBLE: RC hex adapter with wide compatibility for Tamiya for Axial 1/10 RC cars.Specification:Item Type: RC Hex CouplerMaterial: Aluminum AlloySize:Diameter: Approx. 17 mm/0.67inInside Diameter: Approx. 12 mm/0.47inThickness: Approx. 9 mm/0.35inAperture: Approx. 5 mm/0.20inSuitable for Tamiya for Axial 1/10 RC Cars.Package List:4 xRC Hex Coupler 4 x WashersNote:1. Due to manual measurement, please allow 13mm/0.040.12in error, thank you! 2. Due to differences between different monitors, the picture may not reflect the actual color of the item.