This tap die set is made of tough-bearing steel for unbeatable durability and performance. With precise CNC machining and secondary polishing, these tools deliver superior precision. The portable storage case provides secure storage. Say goodbye to patchy and incomplete threads. A professional 116-piece set of taps and dies, including various sizes of 51 pcs taps, 51 pcs dies, 1 T-type tap wrench, 1 screwdriver, 1 tap wrench, 1 tap wrench, 1 head, 1 die wrench, 1 die wrench, 1 screw pitch gauge SAE, 1 screw pitch gauge metric, and 5 extractors.