... Commonly used for platforms, trench gratings, and stair treads etc. Detailed Selling Lead Description steel grate, drainage grating is a NEW ... ,walkway,platform etc.Our main products are steel grating floor, trench cover, well cover, stair treads, fence etc. 1) Bearing Bar (Load ... of a plain surface flat bar. Commonly used for platforms, trench gratings, and stair treads etc. 6) Steel grating standards: ...