Set of 32 taps and dies (metric) including 21 taps: M3 x 0.5, M4 x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5, M12 x 1.75 (3 pieces of each size, M3 pieces ). X0.8. M6X1.0, M8X1.25, M10X1.5, M12X1.75. The tap and die set is made of hardened tungsten steel alloy with high strength and durability. < p>Known for their easy starting ability, these taps and dies are the most commonly used style and are ideal for most hand threading applications. The SAE and Metric Tap and Die Set is constructed of industrial-grade steel that is hardened and heat-treated to a Rockwell hardness of 55 HRC for durable threading performance along with satisfying longevity. The metric tap set is used to process the internal thread, while the metric die set is for the external thread. You will receive a set of 32 metric taps and dies, all originating from a case stainless steel with size mark slots that help store and organize tools and parts, providing easy portability, quick find and avoid losing parts.