MAMABET88 While these uses show the incredible versatility of power drills, their specialty is still boring holes and driving screws; they aren't perfect substitutes for the tools they're meant to imitate. These bits typically range in size from 1/64 inch to 1/2 inch and are commonly used to bore holes in wood and metal. He grabbed the best surgical tool available in a snowy church parking lot in rural Idaho -- a Makita cordless power drill -- and bore a hole in King's skull, relieving the pressure and ultimately saving his life.|In this Type of Vandal-proof System