High carbon steel for hand tapping applications. Tap size and recommended drill bit size are etched on each tool for easy identification. Hexagon dies are best suited to maintenance and repair work. Machine screw, fractional and pipe taps. Comes in a plastic case Set includes: Machine Screw Plug Tap and 1" Hexagon Die in sizes: 6-32 NC, 8-32 NC, 10-24 NC, 10-32 NF, 12-24 NC, Fractional Plug Tap and 1" Hexagon Dies in sizes: 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, 1/2", 20 NF, Fractional Plug Tap and 1-7/16" Hexagon Dies in sizes: 9/16", 12 NC, 916", 18 NF, 5/8", 11 NC, 5/8", 18 NF, 3/4", 10 NC, 3/4", 16 NF, Pipe Thread Plug Tap and 1" Hexagon Dies in sizes: 1/8", 27 NPT, 1/4" 18 NPT, Threading tools: adjustable die stock, 1" dies, adjustable die stock, 1-7/16" dies, T-handle wrench, taps no. 0 to 1/4", adjustable handle tap wrench, taps no. 0 to 1/2", adjustable handle tap wrench, taps no. 1/4" to 1", 18 leaf standard thread pitch gauge.