RAB Lighting MCAP2B Mighty Post Cap for 2" Pipe, 2-3/8" OD x 2-3/4" Height, Black Cap for use with 2-3/8" light posts to hold heavy floodlights securely Die cast aluminum construction for resistance to corrosion Internal seal for protection from weather Set screw locks cap to post (not included) 1/2" threaded hole accommodates most floodlights and lawn lights