22Pcs Set Damaged Screw Extractor Drill Bit Set Stripped Screw Extractor Kit for Broken Bolt Extractor All-Purpose with Magnetic Specifications: Material: High-speed steel 4241 Dimensions: Dr01, Dr02, Dr03, Dr04, Dr05, Dr06, Dr07, Dr08, Dr09, Dr10Ex01, Ex02, Ex03, Ex04, Ex05, Ex06, Ex07, Ex08, Ex09, Ex10 Features: 1. With high hardness, drilling is easier and faster. 2. The stripping screw extractor kit includes 20 pieces of 10 different sizes of stripping screw extractors to meet all your needs. Suitable for screws or bolts of any size. 3. Suitable for screws such as hexagon socket bolts, machine screws, square head bolts, wood screws, hexagon bolts, sheet metal screws, etc. [Instructions for use]: The first step: Use a puller smaller than the diameter of the screw to invert the opening on the screw (as deep as possible), Step 2: Then insert the corresponding large screw head into the deep hole, Step 3: Rotate counterclockwise to remove the screw. Model65A350D2354G860 Packing List: 20 * Damaged screw extractor (Ex#1-#10, Dr#1-#10) 1 * Magnetic extension knife holder 1 * Socket adapter [Tips]: 22pcsA and 22pcsB are just different poles -When the surface of the broken screw is smooth, the hole must be drilled first. Otherwise the drill bit will slip. -When drilling the hole, it must be vertical and low speed. Use this drill in the reverse direction to drill the first hole deeper and easier to take out. -It is best to use a hand drill, not the hammer drill mode! Be sure to use low speed! Notes: 1. Manual measurement, please allow 1~2mm error, thank you.