Features FINE WORKMANSHIP: Well crafted with smoothly appearance and clear threads, these drill bits and extractors can well match with other tools and provide good using experience. CHROMIUM VANADIUM STEEL MATERIAL: Made of premium chromium vanadium steel material, these tools are strong and sturdy, wear resistant and impact resistant, ensures a long service span. 49PCS: There are 49 pieces tools in the package, including extractors, drill bits, etc. Widely used various specifications and sizes. MAIN USE: This screw nut extractor and drill bit kit is mainly used to disassemble damaged screws, nuts, and screws. EASY CARRYING: Comes with a storage box that you can well store these tools without clutter and wear, also for easy carrying and access. Specification: Item Type: Screw Extractor Drill Bit Set Material: Chromium Vanadium Steel Screw Extractor: 1/8in, 5/32in, 3/16in, 7/32in, 1/4in, 9/32in, 5/16in, 11/32in, 3/8in, 13/32in, 7/16in, 15/32in, 3/4. Drill Bit: 5/64in, 7/64in, 1/8in, 5/32in, 3/16in, 7/32in, 1/4in, 9/32in, 19/64in, 5/16in, 11/32in, 3/8in, 13/32in, 7/16in, 15/32in, 1/2in. Nut Extractor: 3/4in, 11/16in, 0.67in, 5/8in, 9/16in, 0.51in, 1/2in, 7/16in, 0.39in, 3/8in, 0.35in, 5/16in, 1/4in. Package List: 16 x Drill Bit  13 x Screw Extractor 13 x Nut Extractor 6 x Broken Screw Extractor 1 x Adapter Rod 1 x Storage Box  Note: Cobalt drill bits should not be used for stainless steel. Package List 16 x Drill Bit 13 x Screw Extractor 13 x Nut Extractor 6 x Broken Screw Extractor 1 x Adapter Rod 1 x Storage Box