... Pitch(center to certer):12.5,15,25,30.16,32.5,34,40,41,25,45,50,60,60.32,80 ... ,100mm etc,also be according to client's requirement and 30,40,60,mm are recommended,America standard is available.3)Cross ... Steel(Low Carbon Steel)or Stainless Steel5)Surface Treatment :Untreated,Painting or Hot dip galvanized6)Steel gratting standards:A)China:YB ...