More usable capacity than oval buckets, more durability than plastic buckets! Because they're hot dip zinc galvanized after the bucket is formed, bending and drilling wont weaken these round buckets. They resist leaks and corrosion, too. Bail ears are welded below rim to prevent interference with wringer. A heavy wire reinforcement is formed into the top rim for added strength. Each perimeter reinforcing rib indicates a one gallon increment. High-density reinforced nylon spider attaches without rivet or bolt holes. Two inch double-raceway ball-bearing casters.