... bar pitches maybe12.5,15,25, 30,34,40,50,60,80mm,of which 30 and 40mm are recommended.3).Corss bar ... pitch maybe 38-200mm,of which 50 and 100mm are recommond.4).Type of bearing bar can be plain, serratted ... )3mm , 5mmMaterialQ235,SS304,SS316Surface treatmentBlack , hot dip galvanizing,paintFields of ApplicationPlatforms ,sidwalks,filter grates,ventilation grates,driling stages, ladder steps ...