... system approval.1. Bearing bar pitches may be 15 to 22, 25, 30, 32.5, 34, 40,50,60,80,90mm,of which ... Steel (Low carbon steel) / Stainless steel Plain style steel grating, Serrated style steel grating and I bar type steel grating, Finished:painted/hot dip galvanized, untreated, painting Steel bar ...