Our selection of recessed housings for use with LED downlights or LED light bulbs includes both four and six inch sizes in two varying styles: a new construction housing with hanger bar arms that's designed to be nailed in, and a retrofit can that's designed for use in an existing ceilings. Several of the cans we carry are brand specific and must be used with the accompanying LED downlight for which they were designed. Please refer to each product's page for specific details.