Features: Made of superior high speed steel, high hardness and anti-corrosion. Each tap extractor is specifically engineered for speedy grab-it and easy out broken screw taps. Works for removing stripped, rusted, broken, or corroded screws and bolts.  Every tap extractor goes through rigorous quality testing, durable to use. Suitable for industrial screw and bolt removal and for everyday home repair work. Specification: Condition: brand new Material: High Speed Steel Weight & Model: (Optional) #A 108g/3.8oz (six-piece set)  Specification Metric System British / American System 1# M4 6# 2# M5 8-10# 3# M6 12#-1/4 4# M7-8 5/16" 5# M9-10 3/8" 6# M11-12 7/16-1/2" #B 493g/17.4oz (nine-piece set) Specification Metric System British / American System 2# M5 8-10# 3# M6 12#-1/4 4# M7-8 5/16" 5# M9-10 3/8" 6# M11-12 7/16-1/2" 7# M14 9/16" 8# M16 5/8" 9# M18-20 3/4" 10# M22-24 7/8-1" #C 656g/23.1oz (ten-piece set) Specification Metric System British / American System 1# M4 6# 2# M5 8-10# 3# M6 12#-1/4 4# M7-8 5/16" 5# M9-10 3/8" 6# M11-12 7/16-1/2" 7# M14 9/16" 8# M16 5/8" 9# M18-20 3/4" 10# M22-24 7/8-1" Package List: 1bag* Tap Extractor Set Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 3.The product is not suitable for too tight break taps, if the tap is too tight it will make the extractor easy to break the jaws, the smaller the extractor the easier it will be to break the jaws.