6 mm - 24 mm Carbon Steel NC and NF Tap and Die Set with Round Dies in plastic case. Set includes: m6 x 1 in., m6 x 0.75 in., m8 x 1 in., m8 x 1.25 in., m10 x 1.25 in., m10 x 1.5 in., m12 x 1.5 in., m12 x 1.75 in., m14 x 1.5 in., m14 x 2.0 in., m16 x 1.5 in., m16 x 2.0 in., m18 x 1.5 in., m18 x 2.5 in., m20 x 1.5 in., m20 x 2.5 in., m22 x 1.5 in., m22 x 2.5 in., m24 x 1.5 in., m24 x 3 in., 1 Tap Wrench, 2 Die Stocks, 1 Screw Driver. About Carbon Taps: Carbon Steel Hand Taps are used to re-thread damaged and/or jammed threads. Carbon Steel Hand Taps may also be used to thread mild steels. Taper Style: Starts the thread square with the workpiece. Plug Style: Generally used in thru holes. Bottom Style: Generate the thread to the bottom of the hole. About Carbon Round Adjustable Dies: For re-threading, a Carbon Steel Round Adjustable Die is desired for improved wear life. Round Dies are chamfered on both faces. 1 side has a 2 in. to 3 in. thread chamfer for threading, the other side has a 1 in. to 1-1/2 in. thread chamfer for threading close to a shoulder. Adjustment is obtained by a fine pitch screw which forces the sides of the die apart or allows them to spring together. The slot is beveled so that when the dies are used in a machine holder the adjusting screw can be removed and adjustment made by the adjusting screws in the holder.