... bar pitches maybe 12.5,15,25,30,40,50,60,80mm,of which 30 and 40mm are recommended.Corss bar ... pitch maybe 38-200mm,of which 50 and 100mm are recommond.Type of bearing bar can be plain,serratted ... ,4mm, 5mmMaterialQ235,SS304,SS316Surface treatmentBlack , hot dip galvanizing,paintFields of ApplicationPlatforms ,sidwalks,filter grates,ventilation grates,driling stages, ladder steps ...