... galvanized steel stair tread, steel stair treads, serrated, plain, I bar , ISO9001 CMPY, GRATING SPECIALIST, Mr.David galvanized steel stair tread, steel stair treads ,hot dip galvanized ... carbon steel, etc 5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating (Mr. David Huang) 6Grating StylePlain ... Japan: JIS (Mr.David Huang) galvanized steel stair tread, steel stair treads