... rigidity of 60-62" after quenching;Upper die is ductile cast iron, while lower die is 50# steel or oil-quenching steel ... -hole,round-hole,oval-hole,stamp pinhole,double-row die hole and indexRound-hole die specification(mm)diameter of 1.00-8.00 ... Square-hole die specificatio(mm)4x4,4x5,5x5,5x6,6x6 elliptical die specification3x2.5,4x3,4.5x3.5 ...