The Brute XSR Step Reamer is a heavy-duty hybrid of two popular tools: the step drill and the maintenance reamer. It is designed to expand the capabilities of a step drill, making this a tool that can take on tougher industrial applications. It is the ideal tool to align or enlarge existing holes, in steel. Super sharp flutes and a unique stepped design allow operators to cut holes in steel plate up to 1/2" thick. Engineered with a 3/8" flatted shank, the XSR can conveniently be used in a portable power drill or drill press. Each tool features five steps (5 drill sizes), which makes it an efficient, productive, high value tool for users who need to cut a variety of bolt hole sizes. This set include three XSR reamers in a convenient case.