●Package includes: 12Pcs wheel hex hubs,4pcs 5mm wheel hubs, 4pcs 6mm wheel hubs,4pcs 7mm wheel hubs. ●Hex size: 12mm,Axle hole: 5mm,Thickness:5mm / 6mm / 7mm. ●Material: Made of aluminium alloy material, which is solid, durable and not easy to deform. ●Prevent Wheels from Getting Stuck: With this wheel hex hub adapter, no matter how tight you screw the wheel nut, the wheel wont get stuck, and the cars shaking problem is also effectively solved. ●Application:RC Aluminum alloy Wheel Hub Clamps are suitable for 1/10 hex 12mm rims wheels car upgrade.