galvanized steel grating prices steel grating material:hot-dip galvanized ,stainless steel stair treads, ... plain type and serrated type bearing bar is 20 x 3 to 100 x 9;the specification of I-section type ... 25 x 5 x 3, 32 x 5 x 3, 38 x 5 x 3, 40 x 5 x 3, 50 x 5 x ... and 30, 40, 60mm are recommended, America standard is available.3) Cross Bar Pitch (center to center): from18.5 to 101 ...