Mobile Container, stacking, 15-1/4" x 19-7/8" x 15-7/16", 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, clear, Made in USA (Priced per each) Must be purchased in multiples of 3