8-piece set of FESTA screw extractors, use: for extracting broken and bent screws, threaded rods..., pre-drilling required, thanks to the reverse helix, gradual drilling into the hole will result in unscrewing - or turning the bent part, for professional use, for professional use, dimensions: 4, 4.5, 6.5, 7.5, 11, 15, 19, 24 mm, practical plastic box for storage.