① Material : DC53(equivalent to SKD11) Hardness : 60-63HRC②Material : SKH51 Hardness : 61-64HRC ③Material : HAP40(SKH40) Hardness : 64-67HRC, Various materials may be used depending on specific operating condition. The imported materials subject to advanced heat treatment and precision abrasive machining ensure premium quality, high dimensional precision, good abrasion resistance, high toughness and non-bending, non-distortion, resulting in significant increasing of punching life.