The Multi-Function Stripping Screw Puller Set contains 20 pieces 10 different sizes of stripping screw pullers that can meet all your needs. Suitable for all sizes of screws or bolts, the screw removal tool maintains high practicality and durability. The easy-to-dismantle threaded screw extractor set contains two extended bit holders. It can be removed in one step without modifying the puller or adjusting the mandrel. The screwdriver is made of high quality 4341 high speed steel, which has high hardness and durability and can easily remove damaged screws. Specification: Item type: screw extractor Material: high speed steel Drill model: DR / EX Features The multi-functional stripping screw extractor set contains 20 pieces 10 different sizes of stripping screw extractors which can meet all your needs. Suitable for all sizes of screws or bolts, the screw removal tool maintains high practicality and durability. The easy-to-dismantle threaded screw extractor set contains two extended bit holders. It can be removed in one step without modifying the puller or adjusting the mandrel. The screwdriver is made of high quality 4341 high speed steel, which has high hardness and durability and can easily remove damaged screws. Operation way: 1. Sizes # 6- # 10 need to be installed in the outlet adapter first, then attach it to the expansion rack (other sizes can be directly connected to the expansion rack). 2. Use a DR drill to drill a hole in the broken screw. 3. Modify to use the same size of extraction bits (Ex). 4. Use the bit backwards and remove the damaged bit. List of packages: 20 x screw extractor (Ex # 1- # 10, DR # 1- # 10) 1 x magnetic extension position holder 1 x plug adapter Note: 1. When the surface of the broken screw is smooth, you need to drill holes first. Otherwise, the bit will slip. 2. It should be vertical and at low speed when drilling. Use this bit backwards, the deeper the first hole drilled, the easier it is to remove. 3. It is best to use electric hand drills