32pcs Tap and Die Set (Metric) includes 21pcs 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 (3pcs of each size, M3pcs). X0.8. M6X1.0, M8X1.25, M10X1.5, M12X1.75. The tap and die set is made of hardened tungsten steel alloy for high strength and durability. 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 hardened steel and heat treated to 55 HRC Rockwell hardness for long-lasting threading performance with 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 coming from a stainless steel case with size-marked slots that help store and organize tools and parts, providing easy portability, quick retrieval, and avoiding losing parts.