Custom c-shaped shelf constructed from 1/8" steel. This has a lip along one edge and six holes bored for mounting on the opposite side. I have a feeling it was previously mounted to the underside of a desk or table, If you bored some new holes it would be easy enough to mount to a wall and use as a 2-tier shelf. We got a bunch of these in, so snag as many as you want to make your industrial chic storage dreams come true! Length = Depth. Height measures 11-5/8". Photo may be representational.