Serrated Steel Grating 1.ISO9001:2000certificate 2.competitive price 3.thickness:0.3-2.5mm 4.material:ASTM A36,A1011,A569 Steel grating&details1. cross bar pitches:maybe 24-200mm,of which 50mm,76mm and 100mm are recommended.2.bearing bar pitches:maybe 12.5, 15 to 30, 40, 60, 80 and 90mm; of which 30 and 40mm are recommended.3.bearing bar:25x3,25x4,30x3,30x4,30x5,32x5,40x5,50x5,.....75x10mm4.. ...