This clamping kits are versatile for many set-up applications for milling, drilling operations. The components are made of mild steel, heat treated and black oxidized for antirust. The steel rack can be mounted to the wall or side of machine or sit on your work bench for easy access. Each clamping kit includes: (24) studs: 4 each of 3", 4", 5", 6", 7", and 8" long, (12) step blocks 3 sizes, (6) T-slot nuts, (6) flange nuts, (4) coupling nuts, and (6) Serrated end hold-downs.