Alden 4017P Grabit Drill-Out Double Ended Bolt Extractor Kit, 4 Piece The product is a 4PC Power Extractor Set Purpose of use for Handtools & Tool Organizers, threading-tap-extractors Manufactured in China Bell-shaped drill head allows tool to be pivoted inside drill hole helping to stay on center. No pilot hole required. 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.