The Housing mounts on 2 inch PVC (2 3/8 outside diameter), can be adapted to mount on other sized PVC uprights. these red led pipe lights are the brightest lights available. and are rated for 100,000 hours Lights perform Brake Lights, Turning, and Running light functions. . NO SALES TAX WHEN SHIPPED OUT OF GEORGIA Kit includes: Two PVC Housings. One Pair of Red LED Pipe lights. One Pair 10 foot Pig Tail Wiring Harness. Four butt Connectors. Eight Stainless Steel Screws. Six scotch locks. ( HOLD LIGHT WIRES SECURE TO TRAILER FRAME ) THESE ARE THE ORIGINAL PIPE LIGHT HIGH QUALITY ALL STAINLESS STEEL SCREWS AND WIRE CLIPS easy to use Installation instructions are included to assist you WE SHIP FAST (REALLY FAST ) NO SALES TAX WHEN SHIPPED OUT OR GEORGIA