... Delivery Detail:time of your requestSpecificationsUnbreakable casting grinding ball JC 1.Size: 17-130mm 2.Hardness:HRC55 ... ballsSize: 20mm-120mmHardness: HRC58-65; Chrome content: 11-14%3. Low chrome cast ballsSize: 20mm-120mmHardness: HRC45-55 ... ):Steel Ball,Grinding Ball,Forged Steel Ball,Casting Steel Ball,Flange,Grinding Media Ball,Forged Grinding Ball,Casting Grinding Ball,Forging Steel Ball,Steel ...