Abstract: A tool for centering a drill or punch on the broken face of a large stud or bolts and for using the tool to break up and remove a large stud or bolt which comprises a collar having a central bore therethrough having a first portion threaded to mate with the stud or bolt threads and a second portion bored to just slide over the stud or bolt threads and an externally threaded cylindrical shaft which is threadably receivable in the collar, said threads being similar to those of the broken stud or bolt, the shaft having extending longitudinally therethrough a plurality of off-center holes, from 3 to about 9 holes, preferably said holes are three in number, are displaced from each by 120°, and are equidistant from the center and the inside of said external threads, said holes being adapted to slidably receive an alignment pin or drill bit.