Wakaisangyo WAKAI Dia Wall White, a wall-mounted tension system specifically for 2x4 lumber. For 2x4 lumber, includes 4 spacers. Thank you for viewing. I no longer need these due to a move, and although I kept them for several years thinking I might use them, I have no plans to. I am selling two sets. There are some areas with yellowing and red paint due to aging. Thank you for your understanding and purchase.