Plug Chamfer - Machine Screw Sizes - Gold & Black National Coarse & National Fine Tap Set in a Index Case. High Speed SteelSizes: 0-80, 1-64, 1-72, 2-56, 2-64, 3-48, 3-56, 4-40, 4-48, 5-40, 5-44, 6-32, 6-40, 8-32, 8-36, 10-24, 10-32, 12-24, 12-28