Metric Tap and Die Set: This TIRDITY 32-piece metric tap and die set includes 21 taps and 7 dies, helps cut and clean internal and external threads in common classic sizes from M3 to M12. The set also includes 1 long handle tap wrench, 1 adjustable die wrench, 1 1/8" flathead screwdriver, and 1 thread gauge to meet all your needs. Hardened Steel: The SAE and metric tap and die set is constructed from industrial-grade hardened steel and heat-treated to Rockwell hardness 55 HRC for long-lasting threading performance and satisfactory longevity. The metric tap set is used to process internal threads, while the metric die set is for external threads. Widely Used: These tools work great for correcting or creating internal and external threads on wood, copper, aluminum, iron, carbon steel, and more. This metric tap set works great for re-threading fasteners, fixing holes for vehicles and machines. Easy-to-Use Design: Our metric and SAT tap and die set is Designed to meet professional needs;