Bridgeport DR-500 5 IN Distribution Ring, Box of 10
https://nsiindustries.com/product/bridgeport-dr-500-5-in-distribution-ring-box-of-10/
Bridgeport Distribution Rings are sturdy aluminum rings designed to support multiple cable runs on walls, ceilings, communication boards or racks, in horizontal or vertical orientations. Built to the high standards of Bridgeport for professional users.