NEW improved tool with steel insert! **UPDATED tool now includes both 1/8" drill bit and steel insert and 1/4" drill bit and steel insert** Tool designed to drill out broken exhaust studs. Can be used with most engines still in the frame. Includes steel inserts and titanium 1/4" and 1/8" drill bit. Tool made from a high performance urethane elastomer that exhibits ultra-high tear and impact properties. Tool has a tensile strength of 11,850 PSI.