... 3.Casting way:pressure welded 4.Steel bar grating machines:4 Specification1).Steel bar grating bearing bar:35x5,32x5,32x4.5,32x3,30x5 ... ,30x3,25x5,25x3,etc.2).Steel bar grating cross bar diameter:6mm,8mm3).Type for casting:By pressure welded ... machines11).Our daily supply ability:500 to 1000 square metersUsage12).Used as platform,trench cover,building,transportations and so on.Certificate13 ...