Lugs are constructed of Food Approved Molded Poly and have a formed bottom designed for cross stacking. Slides support tubs by lip. Top of frame holds tub by base. Casters are 5 x 1" stem swivel. Lug Tubs are sold separately. FOB Shipping Point. Aluminum surcharge may apply. See Related Items tab for Lug Carts - Tubs & Lids. Lifetime guarantee against rust and corrosion and a five-year guarantee against workmanship and material defects.