#4 - 1/2 in. Carbon Steel NC and NF Tap and Die Set with Hex Dies. Sizes#4 - 40 in., #10 - 24 in., #10 - 32 in., #12 - 24 in., #4 - 40 in., #6 - 32 in., #8 - 32 in., 1/2 in. - 13 in., 1/4 in. - 20 in., 1/2 in. - 20 in., 1/4 in. - 28 in., 1/8 in. - 27 in., 3/8 in. - 16 in., 5/16 in. - 18 in., 5/16 in. - 24 in., 3/8 in. - 24 in., 7/16 in. - 14 in., 7/16 in. - 20 in. and 1/2 in. - 20 in. 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 Hex Dies: Carbon Steel Hex Dies are for dressing over bruised or rusty threads, they are the most cost effective rethreading tool available. No special holder is required for this type of die, any wrench large enough will suffice. Ideal for maintenance in the shop or field.