Features: 1. Made of high quality aluminum material, durable and sturdy. 2. Great workmanship and stable in performance 3. Perfect replacement for the old or broken one 4. Durable and long lasting replacement accessory for upgrading your RC model car. 5. Suitable for 1:8 ratio RC model car Specification: Condition: 100% Brand New Ratio: 1/8 Material: Aluminum Length: Approx. 30mm/1.2in(excluding screw position) Installation Inner Diameter: Approx. 8mm/0.3in Optional Color: Black, Titanium Color, Deep Blue Package List: 4 * Extension Adapter 4 * Pin(2.5*13.8mm) 4 * Seal Rings How to check if this is appropriate 1. Just check that all 4 wheels have used 17mm wheels. 2. The shaft diameter is 8mm. 3. The hole on the shaft is 2.5 mm (not suitable if there is no hole). How to install These are inserted into the 8mm shaft and then held in place by the 2mm pins (included). Then place a rubber ring on the pin to keep it in place. Insert the wheel into the 17 mm hex at the end and tighten the end nut Note: 1. Please allow 1-2cm 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. 3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .