steel ball dies have higher accuracy, completely interchangeable, bears high temperature, the higher utilization of hot metal. name:Steel ... thinner, organization more compact, hardness more higher, appearance more aesthetic, high-gloss, no deformation.SpecificationsmodelEight ballΦ20Φ30Φ40Φ50Six ball ... specificationsφ20x35φ60x97φ25x41φ70x113φ30x49φ80x129φ40x65φ90x146φ50x81 Cast iron mold manufacturer