A backing plate for receiving a fastener to secure a horizontal support member to a vertical support member of a shelving unit. The horizontal support member is securable at any one of multiple vertical locations along the vertical support. The vertical support has a linear array of at least two evenly spaced apertures at the one of the vertical locations, and the backing plate has a corresponding linear array of at least two evenly spaced fixing points. At least one fixing point of the backing plate includes a projection for occupying a corresponding one of the apertures in the vertical support.