The pair of U-mount Lighting Stand Accessory Arms from On-Stage Stands utilizes the elliptical enveloping clamp design normally found on u-mount series products. They serve as a pair of brace-less, virtually instant-mount side bars for any standard lighting stand. The versatile u-mount clamps are compatible with 1" and 1-3/8" pipes. With a 2" diameter, aluminum construction, and thick 4mm walls, these arms can easily support up to 3 modern LED lighting fixtures or conventional par cans up to 15 lb.