Constructed Of .024 In. Mill-Galvanized Steel And Seams Protected With Sealant Top Reinforced With 1/4" Steel Wire Rim Heavy Corrugations Give Bucket Extra Strength Embossed, Permanent Graduations For Easy Measuring Of Water And Solution 2" Casters, Rubber Wheels With Ball Bearings; Casters Are Replaceable, But Not Chassis Replacement Part# 25055