This is a 40-piece metric tap and die set designed for cutting and repairing internal and external threads.It includes a range of tap and die sizes from M3 to M12 for both coarse and fine threads.The kit contains essential accessories such as a tap wrench, T-handle wrench, and a screw pitch gauge for checking thread specifications.The components are typically made from durable alloy steel, such as GCr15 bearing steel, to ensure longevity and precise threading.