... engineering, airport project, construction industry and so on.Standard descriptions:1. Bearing bar(load bar):20x3 ..... 75x10 mm.2. Bearing bar ... . US standard: 1"x3/16", 1 1/4"x3/16", 1 1/2"x3/16", 1"x 1/4", 1 1/4"x 1/4", 1 1/2"x 1/4" etc.3 ... , Stainless 3045. Surface treatment: black, galvanized, paint6.Standards:1).China: YB/T 4001.1-20072).USA: ANSI/NAAMM(MBG531-88)3).UK ...