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).