IRWIN Tools Machine Screw with Fractional Tap and Die Set, 12-Piece (24605) Thread sizes: 6-32 NC, 8-32 NC, 10-24 NC, 10-32 NF, and 1/4"-20 NC We're working with a variety of tradesmen to solve endless fastening challenges: Irwin Hanson Taps and Dies are the answer. Whether creating new tools from raw steel or repairing damaged and worn threads, achieving a precise fit is essential Irwin Industrial Tools sets the standard for delivering quality every step of the way in your threading applications T-Handle tap wrench