Dump Site Instructional Sign 18-Inch x 24-Inch of 080 Aluminum. Yellow with Brown Lettering. Mount on two 6-foot, 4-inch by 4-inch treated posts set in concrete. $48.00 Each. The Tower Company, Inc. P.O. Box 1958 Manitowoc, WI 54221-1958 1-800-945-1532 or 1-(920) 682-6091 Fax: 1(920) 682-6094