... .ISO Stair tread is fabricated by grating, nosing plate and side plate.Main type:1. Checkered plate nosing , Bolted fixing anti-slip 2. Checkered ... .,Ltd is the largeststeel grating manufacturer in China. We have 7 running lines with yearly capacity of 50,000tons. Jiulong grating ... . 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.3Cross ...