This 45-piece alloy steel tap and die set features both metric and NC/NF (National Coarse/Fine) thread sizes for repairing or creating screw threads.The kit includes large sizes ranging from 6mm to 24mm for metric applications and is heat-treated for enhanced durability.Included tools are a adjustable die stock, adjustable handle tap wrench, and a screwdriver, all housed in a metal case.It is designed for creating new threads or chasing damaged threads on bolts and nuts.