Tungsten alloyMetric coarse & fine sizesPrecision machined tungsten alloy steel taps and diesSplit dies to facilitate the fine adjustment of core diameterTaps & Dies:6 x 1, 6 x 0.75, 8 x 1.25, 8 x 1, 10, 1.25, 10 x 1.5, 12 x 1.5, 12 x 1.75, 14 x 1.5, 14 x 2, 16 x 1.5, 16 x 2, 18 x 1.5, 18 x 2.5, 20 x 1.5, 20 x 2.5, 22 x 1.5, 22 x 2.5, 24 x 1.5, 24 x 3mmSliding jaw type tap wrench and T-bar type tap wrenchSteel die holder with knurled screwsSpacerScrewdriver