MOBILE CONTAINER, STACKING, 17-1/2" X 16-1/2" X 15-1/2", INJECTION MOLDED HIGH DENSITY POLYPROPYLENE, SIX 1/4" DRILL HOLE PATTERN ON BOTTOM ALLOWS FOR EASY HOLE INSERTION FOR DRAINAGE AND AIR CIRCULATION, INCLUDES: (4) 3" POLYURETHANE SWIVEL CASTERS, BLUE, MADE IN USA