4 In. Concrete Rings, 36 Cu. In., 3 In. Deep, Raised Ground Screw,1/2 & 3/4 In. Ko (20-Pack), 54551

Flat sides provide excellent contact for locknuts, External ears are used to nail the ring to the wood form, Ears on inside of box are for fixtures, Waxed fixture ears prevent concrete from interfering with the threads, The top-cover is removable for before-pour work, Rugged metallic construction