Specification: Color:Silver. Material: Hss high speed steel. Quantity: 6 pieces. Size: 1 pcs × 0 # Available range of screw extractor: 2-3 mm; 1pcs × 1# Available range of screw extractor: 3-5mm; 2 pcs × 2 # Available range of screw extractor: 4-8mm; 1pcs × 3# Available range of screw extractor: 5-10mm; 1 pcs × 4# Available range of screw extractor: 6-12mm. Package includes: 6 x damaged screw extractors. How to use: 1. First, you need to make sure that the screws used are smaller than the screws you want to remove. Make sure there is enough space to drill appropriately sized holes for screw extraction. 2. Start at the tip of the drill bit and drill to create a smooth hole. Make sure the rotation of the drill is “forward”. 3. Swing the drill over the extraction tip. Change the rotation of the drill to “reverse”. Apply slow, steady downward pressure to the screw and move it at low speed. 4.The extraction tip will bite into the screw and pull out the damaged screw. It can be easily