20pcs M3-M12 Screw Thread Metric Plugs Taps & Tap wrench & Die Wrench Set Make of alloy steel and the hardness is up to 62 degrees. With heat treatment, tapping speed and the screw thread is precision. Total 20 pieces set, useful tools for your work :) Package list : Total hand tap : 9 pieces M3 * 0.5 (pitch=0.5 mm) M4 * 0.7 (pitch=0.7 mm) M5 *0.8 (pitch=0.8 mm) M6 * 1.0 (pitch=1.0 mm) M7 * 1.0 (pitch=1.0 mm) M8 * 1.25 (pitch= 1.25 mm) M9 * 1.25 (pitch=1.25 mm) M10 * 1.5 (pitch=1.5 mm) M12* 1.75 (pitch= 1.75 mm ) Total hand die : 9 pieces M3 * 0.5 (pitch=0.5 mm) M4 * 0.7 (pitch=0.7 mm) M5 *0.8 (pitch=0.8 mm) M6 * 1.0 (pitch=1.0 mm) M7 * 1.0 (pitch=1.0 mm) M8 * 1.25 (pitch= 1.25 mm) M9 * 1.25 (pitch=1.25 mm) M10 * 1.5 (pitch=1.5 mm) M12* 1.75 (pitch= 1.75 mm ) Tap Wrench (range) : 1piece M3 - M12 (1/16"-1/2") Die Hand : 1piece M25 (1") Package includes : 1 x 20pcs M3-M12 Tap Die Set