Package includes: 4 * screw extractor. The size of the screw extractor is different. 4 sizes for easily removing screws of different sizes. Double-ended design: The bolt screw extractor set has two functions in one. One end is used for drilling and the other is used for loosening. One has a dual purpose, so you can easily remove damaged or rusty screws and bolts. Suitable for many screws: This set is suitable for many situations, such as old worn screws, rusty screws, soft screws, over-tightened screws, round screws for door locks. Easy to remove damage, stucco, shrinkage, breakage, rust, free-spinning screws and socket head screws. Easy to use: It is easy to use and requires only two simple steps. Use a drill bit to drill a deep hole in the screw head, then reverse the screwdriver counterclockwise to the damaged screw until it is released. Gift for the repairman: The kit is easy to use, and the screw head must first be drilled at the countersink end of the drill bit. The screw can then be easily removed by rotating the drill in the chuck. Suitable for craftsmen, workshops, hobby workshops, family workshops, daily life. This is a very practical gift. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.