The Assault RC foam tire groover is a tool for grooving the Dirt Oval BSR/CustomWorks/RC4Less style tires. This tool is a 5/7 pattern. 5 groove rear and 7 groove front for foam tires to be used on a tire truing machine. It is made out of stainless steel and precisely cut for best results and the Assault RC logo laser etched on the body. This is the last grooving tool you will ever need. Used by the best dirt oval racers in the country so now it's time to get one in your tool box.