Saves nearly 1/4 pound when replacing the steel hardware. This new unique style rear bumper bolt kit allows the main bumper assembly to float free while the bolt is tight in the frame without any chance of the bumper falling out. 10mm bolt. Fits most karts including CRG, OTK, Tony, IPK, Praga, etc. Available in 28, 30 or 32mm (Outer Diameter measurement). Sold Individually.