Set of pullers for broken screws

To extract studs or screws (left-hand thread and right-hand thread) broken off flush: Ø 5 to 14 mm.
The broken stud is unscrewed using the puller inserted into a hole drilled beforehand.
Advantage: the hole in which the stud or screw is housed is not made any wider.
Composition :
- 5 drill bits, 4 to 8.5 mm
- 10 drilling guides, 7 to 17 mm
- 5 nuts
- 5 rods.
Weight: 500 g