Sold in pairs to be used setup to use my axle shaft and compatible with my brake kits. Drill bits are recommended and available in the tools section of the wheels category. Installed as designed the brakes will remain stationary and the wheels will spin. Base design by BlackBoxSTL modified by me to work with my ecosystem. These are the wheels shown on the F1 Pikes Peak body kit, 22x10 fronts and 22x12 rears on my system are within 1mm in all directions of his base design.