GRAINGER 3 ft x 3 ft x 1 in Bar Grating, lightweight and corrosion resistant. 4 in Crossbar Spacing. It helps to provide safe, secure footing for many applications ranging from trenches to decking. Because it can be easily cleaned and does not absorb bacteria sustaining particles it can be used for sewage and waste treatment plants, chemical process industry, off-shore rigging drills, marine applications, and more.