General description The 40Pcs Tap and Die Set M3-M12 is designed for creating threads in various materials, making it ideal for vehicles and machines. This comprehensive set includes 17 taps and 17 dies, all made from heat-treated 45# steel and alloy steel, ensuring good hardness, high strength, and long durability. Technical specifications Material: Heat-treated 45# steel and alloy steel Includes: 17 taps and 17 dies Size range: M3-M12 Compatibility and accessories Includes a thread gauge for checking created threads Adjustable tap wrench for different tap sizes