Different sizes: There are a total of 5 extractors in various sizes for screws from 4mm to 18mm diameter. The tool steel pullers have a left-handed spiral flute designed for increased gripping power. Aggressive left-handed (pullers) and right-handed (bits) spiral-wound design for increased gripping power Design Concept: This set is designed to remove damaged, rusted or peeling screws, bolts, fasteners, metal taps and water pipes, etc. High quality: The drill bits are made of high speed steel for high toughness that could drill into most screws. The grinding bits can also be used to drill holes in wood, metal, plastic, brick and wall etc. Easy to use: Drill a hole in the center of the broken screw first with the appropriate drill bit, then use a suitable extractor to remove the screw. Drill bit diameters and recommended removal diameters for broken screws are stamped on the box Kind Notes: Which you can use with a tap handle that holds the juicer firmly; for the large puller, you can use an adjustable wrench. You can use an adjustable wrench to hold the puller firmly Features: This set is designed to remove damaged, rusted, or stripped screws, bolts, fasteners. The tool steel pullers have a left-handed spiral flute designed for increased gripping power. There are a total of 5 extractors in various sizes for screws from 4mm to 18mm diameter. Easy to use, first drill a hole in the center of the broken screw, then use a suitable puller to take out the screw. You can use an adjustable wrench to hold the puller firmly when removing the screw. Budget: Material: GCR15 tool steel Suitable Screws (Diameter): 1 #: 4 ~ 6mm 2 #: 6 ~ 8mm 3 #: 8 ~ 11mm 4 #: 11 ~ 14mm 5 #: 14 ~ 18mm Colour: Black Dimensions: 81x8.3mm, 71x6mm, 66x5.1mm, 58.5x3.3mm, 53x3mm Package includes: 5 x extractors