RC4WD Z-S0407 Mini 12mm Wheel Widener (4) FEATURES: Widens each side of truck by 0.47 (12mm) CNC machined aluminum construction Stainless steel mini barrel nut Compatible with any 12mm hex wheels such as those used on the Tamiya F-350 Tundra Jeep Axial AX10 Losi Crawler RC4WD Timberwolf and Bully.;INCLUDES: Four RC4WD Mini 12mm Wheel Wideners Four Barrel Nuts Eight Washers.