Typical center to center distances of the gratings:
30mm Gratings: This is the most strong industrial steel gratings. Widely used in metallurgy, drainage, stair treads, chemical plants, walkway, etc.
40mm Gratings: This is the most economic type widely used for light bearing surface, walkway, stair gratings, etc.
60mm Gratings: This kind is special for mine industry gratings.
30mm Gratings: This is the most strong industrial steel gratings. Widely used in metallurgy, drainage, stair treads, chemical plants, walkway, etc.
40mm Gratings: This is the most economic type widely used for light bearing surface, walkway, stair gratings, etc.
60mm Gratings: This kind is special for mine industry gratings.