Take it to the next level with the Razor Ultra Pro series scooter accessories Transform your pro scooter the way you've always wanted! Built from lightweight yet rugged 4130 CroMoly steel construction Measures: Height: 21 inches (533mm), Width: 18 inches (457mm), Outer Diameter: 1.25 inches(31.8mm) Compatible with all standard 1-1/8? threaded steering tubes, including Razor?s Ultra Pro, Pro Series X,XX,XXX, Black label Pro scooters