41 Piece, SAE Machine Screw & Fractional Tap & Hex Die Set, Dies Are Ideal For Routine Maintenance, Repair Work & For Rethreading Where High Accuracy & Tolerance Thread Is Not Critical, Taps Have Straight Flutes Which Are Ground To Provide Rapid Chip Removal For Efficient Threading, Designed For Hand Threading Work In A Variety Of Materials Taps Produce A Class 2B Thread, Includes Machine Screw 4 x 40NC, 6 x 32NC, 8 x 32NC, 10 x 24NC, 10 x 32NF, 12 x 24NC Tap & Dies, Fractional 1/4" x 20NC, 1/4" x 28NF, 5/16" x 18NC, 5/16" x 24NF, 3/8" x 16NC, 3/8" x 24NF, 7/16" x 14NC, 7/16" x 20NF, 1/2" x 13NC, 1/2"X20nf Taps & Dies, Pipe 1/8" - 27NPT Tap & Die, Plain Die Stock For 5/8" Hex Dies, Adjustable Die Stock For 1" Dies, Adjustable Handle Tap Wrench For Taps #0-1/4", T-Handle Tap Wrench For Taps #0-1/4", 2 In 1 Tap Wrench For Taps 1/4"-1/2", 18 Leaf Standard Thread Pitch Gauge.