Pro grade material and strength - Made of C45 carbon steel Set includes 9 metric taps, 9 metric die, tap holder, die holder - 3×0.5,, 4×0.7, 5×0.8, 6×1.0, 7×1, 8×1.25, 9x1.25 , 10×1.5, 12×1.75 Multi use - Create new threads or fix damaged threads with steel, aluminum and brass Premium Cutting - Accurately CNC machined teeth for precise cutting and threading Lifetime Warranty - We guarantee this tap and die set for life Edward Tools Pro 20 Piece Tap and Die Set is a pro grade tap and die set that includes 9 metric taps and die, tap holder and a die holder. This set allows you to create new threads or fix damaged threads with steel, aluminum and brass. The set includes the following metric sizes - 3×0.5,, 4×0.7, 5×0.8, 6×1.0, 7×1, 8×1.25, 9x1.25 , 10×1.5, 12×1.75. Edward Tools Pro 20 Piece Tap and Die Set comes with a lifetime warranty.