Main Function ： This set is designed to remove damaged, rusted or bare screws, bolts and fasteners. Main function ： This set is designed to remove damaged, rusted or bare screws, bolts and fasteners. Benefit ： Tool steel pullers have a left spiral flute designed for extra gripping power. Material ： Drill bits are made of high speed steel for high hardness that can drill most screws. Complete tools ： Come with a faucet handle which can firmly hold the extractor; for the large puller you can use an adjustable wrench. Easy to use ： Drill a hole in the center of the broken screw first with the appropriate bit, then use a suitable puller to remove the screw. Specifications: Material: HHS (drill bits), tool steel (extractors) Suitable screws (for reference only): # 1 for M3 ~ M3.5 # 2 for M4 ~ M4.5 # 3 for M5 ~ M7 # 4 for M8 ~ M9 # 5 for M10 ~ M12 Drill diameter: 2.0mm, 3.0mm, 4.0mm, 6.5mm, 7.5mm Package Include: 1 x Set of Broken Screw Extractors Note: This is not 'not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the picture. item. Due to manual measurement. Please allow deviation. Thank you!