Based on this product's specifications, here are some alternatives and similar models
Rack accessory SCHROFF Pentair X-19" Angle with Grip Holes 3U
Summary description:
Metal rack accessory by SCHROFF Pentair: a 3U 19-inch angle bracket with grip holes designed for mounting equipment and organizing cabling in server and network racks. Provides structural support and convenient handling points for installation and removal of components. Suitable for professional data center, telecom and industrial enclosures.