Specifications: 1) High tensile cast iron precision die sets (English), custom die sets (steel die sets) 2) Materials: cast iron HT 250 for the cast iron die sets, 1020# steel for the steel die sets, Gcr15 as the guide leads material 3) Parallelism: the upper plate and down plate should not be bigger than 0.03mm Outer packing: 1set/ctn