STRUCTURAL PLASTICS TSB44 - TREE GRATE SQUARE PLASTIC 4 FT X 4 FT. - TREE GRATE MATERIAL RECYCLED PLASTIC SHAPE SQUARE SIZE 4 FT X 4 FT. THICKNESS 2 IN. COLOR BLACK FEATURES PRE-SETS ON GRATE FOR EASILY EXPANDING THE GRATE CORE FOR LARGER TREES ON SITE...