Drill/Extractor Set Double-Ended And Power Extractor Bits Number of Pieces 10 For Removing Studs Bolts Screws Screws #6 to #14 and Bolts #5 and #6 to 1/2 In. 3 to 12mm For Removing Pipe - M2 And H13 High Speed Tool Steel Use In Reverse Only Chuck Directly Into Drill Double-Ended Bits Have Self-Centering Drill Tip On One End And Serrated Extractor On Other End Power Extractor Bits Have Self-Centering Drill Tip And Serrated Extractor On One End