Alden 4507P Micro Grabit Broken Bolt Extractor 4 Piece Kit The product is a Micro Power Screw Extractor Set Two-step drill bit and extractor in one tool with a self centering drill tip; no walking or wandering. No grinding, center punching required. Works on jagged uneven rough breaks. No grinding, Center punching required. Tempered twice for extra hardness. Results in multiple extractions per tool. Made from M2 HSS. Highest quality steel used and made in the USA.