Trim gasket provides Air-Tite seal preventing airflow Square die cast aluminum trim ring / glass lens offer high-clarity for high-lumen transmission along with a subtle diffusion of source brightness Multiple trim options allow Halo H4 LED recessed downlights to be used in a wide range of interior spaces Mounting with twist-action friction lock to 4 in. LED light engine Solite glass lensed trims offer high-clarity and high-lumens Trims and baffles available in various finishes/shower light trims with wet location listing Precision formed aluminum reflector/precision design and materials for a high-quality fit and finish