Made with a strong, durable, injection-moulded composite material. Two-piece design makes changing worn carpet easier. Bracket is made of 1-1/2" square tubing. Bunk measures 24" long, and is adjustable up to 14" in or out per side. Two height settings to accommodate your boat perfectly. Works with bunk or roller-style trailers. Mounting brackets fit a trailer frame up to 2"W x 5"H. Per Pair.