The Rail Rockit Basic set includes two Rail Rockit brackets, eight universal adapters, and an instruction manual. Rail Rockit brackets can be installed, moved, and removed in just seconds. Each set will hold up to 70 pounds and will never damage your deck. It's All in the Adapter! The included adapter allows each bracket to fit up to five different sizes of wood, composite, and vinyl square pickets (1 1/4 - 1 1/2 - most standard 2 X 2). Wrought Iron adapters sold separately.