General description This TIRDITY 32-piece metric tap and die set includes 21 taps and 7 dies, helping to cut and clean internal and external threads in common sizes from M3 to M12. The set is designed for both professional and DIY use, making it ideal for re-threading fasteners and fixing holes in various materials. Technical specifications Material: Industrial-grade hardened steel Heat-treated to Rockwell hardness: 55 HRC Includes: 21 taps, 7 dies, 1 long handle tap wrench, 1 adjustable die wrench, 1 1/8" flathead screwdriver, 1 thread gauge Usage Processes internal threads using the tap set Processes external threads using the die set Suitable for wood, copper, aluminum, iron, carbon steel, and more