Note: The color of the item may vary slightly due to photography and your own computer.Item:12mm Aluminum Wheel Hex Drive Hub Adaptor (4P) & M4 Locknut (4P)Package Include: 4 Pieces 12mm Aluminum Wheel Hex Drive Hub 4 Pieces Aluminum M4 Locknut Compatible with:RC Hobby Cars | Hex Dimension: Hex 12mm; Thickness:5mm; Axle Hole Diameter:4mm | CNC machined for precision.Increased strength and precision.Easy upgrade from the original part | Package include: 12mm Aluminum Wheel Hex Drive Hub Adaptor (4PCS) & M4 Locknut (4PCS) | Produced By HobbyPark ,Well made and durable,100% New