Fits Madd Beginner , Madd Pro Base model, Team and Nitro and ninja Models(that have one screw hole on the brake attachment area), as well as Slamm scooters once you've drilled a small hole on your deck. Will also fit JD BUG, Razor etc with alterations, you will need to drill an extra hole in the top of your deck. Fits 100 and 110mm .