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 kit is made of hardened tungsten steel alloy with high strength and durability. < p>Known for their easy-start 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 hardened steel and heat treated to Rockwell hardness 55 HRC for durable threading performance accompanied by satisfactory longevity. The metric tap set is used to process internal threads, while the metric die set is for external threads. You will receive a set of 32 metric taps and dies, all from one case made of stainless steel with size-marked slots that help store and organize tools and parts, providing easy portability, quick searching and avoiding losing parts.