11PCS Screw Extractor Broken Bolt Remover Drill Guide Bits Set With Holder Frame Tools Size 4mm-11mm Designed to remove damaged, rusted or stripped screws, studs, bolts, fastener, metal water tap and water tube, etc Made from HSS carbon steel, tempered twice, hardness level is 62-63HRC 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 each tool Drill bits can also be used to bore holes on wood, metal, plastic, brick and wall, etc More Details: Extractor Diameter: E 1 for 1/8""-1/4"" (3-6mm) E 2 for 1/4""-5/16""(6-8mm) E 3 for 5/16""-7/16""(8-11mm) E 4 for 7/16""-9/16""(11-14mm) E 5 for 9/16""-3/4""(14-18mm) Drill Bit Diameter: 5/64Inch(2.0mm), 7/64Inch(3.0mm), 5/32Inch(4.0mm), 1/4Inch(6.0mm), 19/64Inch(7.0mm) Included Components: 5 x Drill Bits 5 x Extractors 1x Holder Frame"