For use with 10" [254mm] diameter hole. All devices are recessed 4 1/2" [114mm} below the finished floor level. Unit ships complete with a disposable construction cover. Unit works with 10" Evolution cover assemblies (10CTC). All cover assemblies are sold separately and are available in the following finishes: black (BK), gray (GY), nickel (NK), brass (BS) and aluminum (AL). The covers are also available in two plated finishes: brass (PB) and satin chrome (SC).