Description: Made from Chrome vanadium steel, high hardness, rustproof, solid and durable. Works with any drill and any screw size or bolt, great for stripped, broken, stuck or damaged and screw removal in a few seconds. Designed for removing damaged, rusted or stripped screws, studs, bolts, fastener, metal tap and water tube, etc. Aggressive left handed(extractors) and righted handed(drill bits) spiral flute design for extra gripping power. Drill bits' diameters and recommended extract diameters of broken screws are etched on case. Drill bits can also be used to bore holes on wood, metal, plastic, brick and wall, etc. It is good for all homeowners, woodworkers, mechanics, artists, hobbyists, etc. Specification: Material: Chrome vanadium steel Color: Silver+Black+Green Size: 3-12mm Extractor Diameter: 1# for 1/8"-9/64" (M3-M3.5) 2# for 5/32"-11/64" (M4-M4.5) 3# for 13/64"-9/32" (M5-M7) 4# for 5/16"-23/64" (M8-M9) 5# for 25/64" -15/32" (M10-M12) Drill Bit Diameter: 1#: 5/64" (2.0mm) 2#: 7/64" (3.0mm) 3#: 5/32" (4.0mm) 4#: 1/4" (6.5mm) 5#: 19/64" (7.5mm) Tap Wrench: 19cm/7.5'' Package Includes: 10 x Drill Bits 1 x Extractors 1 x Assortment Case Note: Please allow 1-3mm error due to manual measurement, pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item, pls understand, thank you