ITEM NAME:12mm Hex 15mm Hub Extension Longer Adapter for RC Car Axial SCX10 HPI Red Description: Perfect design, exquisite workmanship and high performance. Light weight and portable to carry, high quality and durability in use. Made of metal with high quality and easy to install on your RC car The coupler increase the vehicle's stability, cornering speed, and brake efficiency. Specially designed for 1/10 Hsp Rc4wd Axial scx10 D90 Hpi RC Car Crawler. Specification: Material: Metal Color: Red Suitable for: Hub aperture 5mm, Axle screw 4mm Hex: Approx. 12mm / 0.47in Length: Approx. 15mm / 0.59in. Weight: 29g / pcs Package Includes: 4 Pieces 12mm Hex 15mm Coupler 1 Suits Screws Spare Parts Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be 1-2mm error in size. SKU: MNF0013546861014540.Specially designed for 1/10 Hsp Rc4wd Axial scx10 D90 Hpi RC Car Crawler. 4 Pieces 12mm Hex 15mm Coupler. Hex: Approx. 12mm / 0.47in. Length: Approx. 15mm / 0.59in. Suitable for: Hub aperture 5mm, Axle screw 4mm.