13 screwdriver sizes: 1/4" - 5/16" (8 mm) - 3/8" - 10 mm - 7/16" (11 mm) - 12 mm - 1/2" - 13 mm - 9/16" ( 14 mm - 5/8 inch (16 mm) - 17 mm - 11/16 inch - 3/4 inch (19 mm) 6 pieces bolt screw extractor sizes::1#, 2#, 3#, 4#, 5#, 6#；6 large HSS drills::3/32", 1/8", 5/32", 1/4", 9/32", 3/8" For loosening screws, nuts and bolts, regardless of whether the receiver thread or l-hexagon is damaged Caution!!!!!!: With this tool, abrasion is unavoidable when dismantling screws, nuts and bolts. We therefore recommend that you do not always use the same hexagon socket to loosen screws, nuts and bolts of the same diameter. Product description Contents: Screw extractors: 1/4" - 5/16" (8mm) - 3/8" - 10mm - 7/16" (11mm) - 12mm - 1/2" - 13mm - 9/16" (14 mm) - 5 /8" (16 mm) - 17 mm - 11/16" - 3/4" (19 mm) Drive: 3/8" Material: Chrome-molybdenum steel< /p> 6 pieces of bolt screw extractor sizes::1#, 2#, 3#, 4#, 5#, 6# Drills in 6 sizes made of HSS::3/32", 1/8", 5/32", 1/4", 9/32", 3/8"