This economy tap and die set includes 14 taps with a matching screw plate. Tap sizes are: 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm. The highly tempered tool-steel screw plate is a threading die with a purpose to hand form external threads on bolts and screws. Tool is pierced with one or more holes for threading which increase in size and are either circular or double-notched. The included taps are similar to drills and correspond to match the die sizes. Please contact us with any questions. Please visit our store for other great jewelry tooling items such as; Hand Stamps, Disc Cutters, Polishing Compound, Buffers, Hammers, Tweezers, Mandrels, Anvils, Vises and more! Thanks for Looking!