The RPM Head Guard was designed to withstand the toughest of rollover crashes and beg for more, Our head protector has an additional 0, 100"" or almost 1/8"" of additional thickness on top to add extra skid and impact resistance to the fragile cooling fins of the stock Traxxas 2, 5 head, Additionally, our Head Guard has a positive locking system that absolutely will not allow the Head Guard to pull itself free during a crash, The RPM Head Guard is designed specifically for the Traxxas 2, 5 stock engine head which is currently used in many Traxxas models including the Revo, Jato, T-Maxx, S-Maxx, SportMaxx, Nitro 4-Tec 2, 5, and Nitro Rustler 2, 5, The RPM Head Guard comes with a full set of screws as well as complete installation instructions, Color: Blue, SKU: RCHOB1598