Valley Universal Step Bumper Receiver Tubes are used for step bumpers with flat bottoms. Its gross trailer weight (GTW) is 3,500 pounds and tongue weight (TW) is 350 pounds. It needs minimum 4.5" deep flat mounting surface. They have four hole design which attaches to bumper only. It comes with two chain loops integrated into hitch body. It has a corrosion resistant powder with polyester black paint finish. They come with a quality steel construction. It requires some drilling.