Round Cut Out hole: The 4 inch suqare recessed lighting is round cut our hole, cut out size is 4” (102mm). It’s with a wide edge Five CCT in One Light: 4 inch suqare recessed lighting can meet your needs in 2700/3000/3500/4000/5000 K, just use the toggle switch on the junction box to choose the most-desired color which best fit in your house High Brightness: 4 inch suqare recessed lighting is 550 lm Ultra Thin Light Body: 4 inch suqare recessed lighting can be installed in narrow space, only need 2 inches clearance of ceiling space. It can be installed directly on the ceiling without housing. Save your time and money Super Easy Installation: 4 inch suqare recessed lighting with junction box could be installed directly on the ceiling without housing. Save your time and money Smooth Dimming Performance: 4 inch suqare recessed lighting work with triac dimmers, smooth dimming from 5% to 100% without flickers or buzzes Trustworthy Product: ETL-listed safety standards; IC rated recessed downlight is permitted to be in contact with insulations in ceilings 4 Inch Square Recessed Lighting