... higher, appearance more aesthetic, high-gloss, no deformation. Grinding ball mould has higher accuracy, completely interchangeable, bears high temperature ... , the higher utilization of hot metal. Name: Grinding ball mould With special alloy materials, advanced production technology ... Φ50, Φ60 Four ball: Φ50, Φ60, Φ70, Φ80, Φ90, Φ100, Φ110, Φ120 Three ball: Φ130, Φ140 Grinding balls Mould