This support bracket, with keel rollers included, can be installed on a boat trailer to support the bottom part of the boat, which makes it indispensable for your trailer and vessel. Since the width of our bottom support bracket can be adjusted, it is perfect for boats from 2' 7" – 4' wide, which suits both big and small vessels. Constructed of high quality zinc-coated steel, this bottom support bracket will offer you a long-term service life.