Features High Speed Steel Material: The screw extractor made of high speed steel has high hardness, strong and wear resistant. Fine Thread: The screw extractor has fine thread, which can quickly and easily remove broken screws, sliding screws, etc. Square Head Design: The square head of the puller is designed to fix ratchet wrenches and multi function wrenches for easy force application. Higher Durability: The puller adopts not easy rust and tarnish design to provide higher durability and accuracy. Application: The screw extractor is used to remove peeled screws, bolts and other fasteners. Specification: Item Type: Broken Screw Extractor Material: High Speed Steel SpecificationDiameter (Approx.)Total Length(Approx.)Thread Size End(Approx.)Shank Diameter(Approx.)1# 4mm / 0.2in52mm / 2in3.0-4.2mm / 0.1-0.2in3mm / 0.1in2# 4.5mm / 0.2in58mm / 2.3in3.4-4.8mm / 0.1-0.2in3.6mm / 0.1in3# 6.5mm / 0.3in65mm / 3in4.4-4.8mm / 0.2-0.2in5.3mm / 0.2in4# 7.5mm / 0.3in75mm / 3in5.3-7.3mm / 0.2-0.3in6.35mm / 0.2in5#11mm / 0.4in82mm / 3.2in7.4-10.3mm / 0.3-0.4in9.3mm / 0.4in6# 15mm / 0.6in92mm / 3.6in10-14.2mm / 0.4-0.5in12mm / 0.5in7# 20mm / 0.8in96mm / 3.8in 11-18mm / 0.4-0.7in15mm / 0.6in8# 24mm / 0.9in107mm / 4.2in16-23mm / 0.6-0.9in19.4mm / 0.8in Package List: 8 x Screw Extractor 1 x Plastic Box Note: Please match the appropriate size when using Package List 8 x Screw Extractor 1 x Plastic Box