... company with industry and trade integrationMain ProductsGrinding Steel Ball, Mild Steel Ball, Casting Steel Ball, Ball Bearing, Valve Ball etc.Producing EquipmentCNC machine SHENGYU & SYX42, ... Spring machine Jinju & 502S, Screw machine Hexing/SX & H series, Shaft machine Liqiang, Auto lathes Libo & XB, Inclinable press ... click our website: http://gdsx.en.alibaba.com Steel ball ,grinding media stell ...