Features 1、[Sturdy Construction] The screw and bolt extractors are made of Cr Mo steel, rust prevention and heat treated, while the drill bits feature high speed steel structure, ensuring durability. 2、[Versatile Application] Ideal for removing stripped, rusted, rounded, or freezing bolts, nuts, fasteners, and screws, this set provides a comprehensive solution for various fastening issues. 3、[Heavy Duty Nut Remover] The heavy duty nut extractor is designed to safely remove corroded or damaged nuts without damaging the bolt threads, ensuring safe disassembly. 4、[Wide Compatibility] Compatible with electric drills, ratchets, hex keys, this extractor set caters to a variety of tool requirements, offering versatility and convenience in tool usage. 5、[Standardized Sizes] Featuring multiple standardized sizes for universal compatibility in various scenarios, this screw and bolt extractor set provides a convenient and efficient solution for fastener removal. Specification Item Type: Screw and Bolt Extractor Material: Cr Mo Steel Specification: 6 Pieces HSS Twist Drill Bits: 3/32in, 1/8in, 5/32in, 1/4in, 9/32in, 3/8in 13 Pieces Metric and Imperial Bolt Extractor: 1/4in, 5/16in 8mm, 3/8in, 10mm, 7/16in 11mm, 1/2in, 12mm, 13mm, 9/16in 14mm, 5/8in 16mm, 17mm, 11/16in, 3/4in 19mm 1 Piece 1/4in to 3/8in Quick Release Adapter 6 Pieces Coarse Thread Screw Extractors: 1#(3-6mm), 2#(6-8mm), 3#(8-11mm), 4#(11-15mm), 5#(14-18mm), 6#(17-21mm) Package List 6 x Coarse Thread Screw Extractor 1 x 1/4in to 3/8in Quick Release Adapter 6 x High Speed Steel Twist Drill Bit 13 x Bolt Extractor 1 x Storage Box