Patent ID: 7008149

Claim:
A tool kit for use in making a substantially perpendicular indented surface around an existing threaded bolt hole in a workpiece, said kit comprising: a guide rod including a threaded distal end that threadedly fits within the threaded bolt hole of the workpiece, and a cylindrical proximate end having a first diameter; and a grinder drill bit including a shank adapted to be coupled to a shank lock of an electrical drill; an elongated hollow cylinder attached to said shank, said elongated hollow cylinder having a centrally disposed orifice, said centrally disposed orifice having a internal diameter larger than the first diameter of the cylindrical proximate end of said guide rod, wherein said cylindrical proximate end of said guide rod is slidably insertable within said centrally disposed orifice of said elongated hollow cylinder of said grinder drill bit; and a cutting element attached to a distal end of said elongated hollow cylinder.