... OEM by customers' requirement 4.ISO Galvanized stair tread are made from steel gratings and other forms ... products are a part of construction. We produce steel grating, stair tread, fence,clips, chench cover, handrail stanchion, walkway ... on.Standard descriptions:1. Bearing bar(load bar):20x3 ..... 75x10 mm.2. Bearing bar pitch: 12.5, 15, ... 1/2"x 1/4" etc.3. Cross bar pitch: 38,50,76,100,101.6mm4. Material ...