32-Piece Tap and Die Set (Metric) includes 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 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 a Rockwell hardness of 55 HRC for long-lasting threading performance and satisfactory longevity. The metric tap set is used for processing 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 preventing lost parts.