Product description of  25 Piece Profi Bolt / Threaded end, Stud removal tool set
This set is the best way to remove broken bolts or studs. With the supplied drill guides you can effortlessly center drilling without making unnecessary damage. Then place the matching pin in the drilled hole and the bolt can be loosened.
Technical data of the  25 Piece Profi Bolt / Threaded end, Stud removal tool set.
Drill 5 HSS 1/8"(3,175mm), 3/16"(4.76mm), 1/4"(6.35mm), 5/16"(7.94mm), 11/32"(8.73 mm).
10 drill guides 9/32"(7.14 mm), 5/16"(7.94 mm), 11/32"(8.73 mm), 3/8"(9.53 mm), 13/32"(10, 32mm), 7/16"(11.11mm), 15/32"(11.91mm), 1/2"(12.7mm), 17/32"(13.49mm), 9/16"(14.29 mm).
5 Extractor nuts N1 - 1/8"(3.175mm) N2 - 3/16"(4.76mm) N3 - 1/4"(6.35mm) N4 - 5/16"(7.94mm) N5 - 11/32"(8.73 mm).