... :2000certificate 2.competitive price 3.Grating size3'x20', 3'x24', 3'x30', 1000x100 Steel grating is made by the world first ... quality gratings with firm welding,smooth surface and high strength.Steel grating&details1. cross bar pitches:maybe 24-200mm,of which ... , sending out the heat , flameproof and slip resistance well.Steel grating &UsageOur products are widely used in the national defense, chemical ...