Machine screws: 4 - 40 NC, 6 - 32 NC, 8 - 32 NC, 10 - 24 NC, 10 - 32 NF and 12 - 24 NC. Fractional: 1/4" - 20 NC, 1/4" - 28 NF, 5/16" - 18 NC, 5/16" - 24 NF, 3/8" - 16 NC, 3/8" - 24 NF, 7/16" - 14 NC, 7/16" - 20 NF, 1/2" - 13 NC and 1/2" 20 NF. Metric: 5/8 hexagon: 3mm - 0.5, 4mm - 0.7, 4mm - 0.75, 5mm - 0.8, 5mm - 0.9 and 6mm - 1.0. The Irwin Tools 26376- 76 Piece Machine Screw/Fractional/Metric Tap and Hex Die Super Set contains 6 machine screw taps and 6 dies, 10 SAE Taps and 10 Dies, 16 Metric Taps and 16 Dies, 2 pipe taps and 2 dies, plus all the tap and die drive tools needed for the included taps and dies. The Taps and Dies are made of High Carbon Steel.