... worldwide quality standards.1. Bearing bar specification: 25 x 3 to 60 x 62. Bearing bar pitch:12.5,15,25, ... and 50,100mm are recommended.4.Type of bearing bar:serrated style5. Material: mild steel, stainless steel6. Surface ... and ladders etc.Grating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, 30.16, 32.5, 34, 40 ... , 41.25, 45, 50, 60, 60.32, 80, 100Cross bar pith(mm)38 ...