The Arlington FLB6230NLLR flip lid style metal cover kit with 2 6" round nickel leveling rings.Arlington's FLOOR BOXES, COVER KITS,and accessories FOR NEW CONCRETE are the low cost, convenient way to install a receptacle flush with a new floor. Made of heavy-duty plastic, our non-metallic concrete floor boxes have more! - SIX conduit hubs and FOUR plugs. And THREE options for positioning the low voltage divider in the box. The leveling ring makes installing a cover easy on ANY 4.5" concrete box. It's REVERSIBLE! Side A fits any 6" round cover with a 3-1/2" screw hole pattern. Side B has a second set of holes that fits 6" covers with a 3-3/8" screw hole pattern.