Features 1、Aluminum Alloy: This RC wheel hex hub is made of aluminum alloy material, light, strong, durable, can be used for a long time. 2、Superior Craftsmanship: This RC hex adapter is CNC finished and anodized, which has increased its strength and accuracy. 3、Perfect Replacement: This crawler wheel hex can be used to replace old and damaged original parts with easy replacement. 4、Easy to Install: This hex drive adapter for RC crawler is simple to use and can be easily installed and removed without professional skills. 5、What You Get: This RC accessory contains 4 pcs 12mm wheel hex hubs with offset extension, suitable for 1/10 RC climbing car universally. Item Type: Wheel Hex Hub Material: Aluminum Alloy Weight: Approx. 18g/0.6oz Diameter: Approx. 12mm/0.5in Height: Approx. 20mm/0.8in Suitable for: 1/10 RC climbing car universally Package List 4 x Wheel Hex Hubs 4 x Offset Extensions 4 x Machine Screws