The RC wheel hub only fit for the rc wheel hex which has 6-hole style, like 1.9 2.2inch VP rims, not include the screws,perfect Compatible with Axial SCX10 Traxxas TRX4 D90 1/10 RC Crawler . Made of quality aluminum alloy, strong and durable. It can extend or reduce the wheel distance,easy and convenient for installation. A great replacement or upgrade part for the old or broken one, and directly fitment. Item Name:RC Car 12mm Wheel Hex Material: Aluminum Alloy Wheel Hex: 12mm/0.5" Thread Diameter: 3mm/ 0.1" Diameter of Center Hole: 7mm/ 0.27" Height: 6mm/ 10mm/ 12mm/ 15mm/ 18mm/ 22mm(Optional) Color: Black/ Silver(Optional) Quantity: 4PCS Package List: 4 x RC Car 12mm Wheel Hex Hub