... : Hot dip galvanized , Painted , Untreated.3) Shape of bearing bars: Plain style , Serrated style , I section style4) Bearing bar specification:- Plain Type and Serrated ... : 15mm, 25mm, 30mm, 33. 5mm, 37. 5mm, 40mm, 50mm, etc. and 30, 40, 60mm are recommended.& 60mm6) Cross bar pitch: 25 ... , 38, 50, 50. 8, 76, 100 & 101. 6mm etc. and 50, 100mm are recommended .7)Main usage: stair trends, trench ...