Elk Lighting TR30BN Recessed Brushed Nickel Under Cabinet Lighting and Accessories UL listed for indoor use Outside Diameter 8" IC and Non- IC, ps9 shallow housing compatiable Standard 6" trims use coil springs to attach to the socket plate inside the housing. They are indpendent of the lamp position, and may not be used with any NSP housing. wattage requirements vary depending on housing and trim combinations and application