Our LSA7700P u-mount Lighting Arms add support for additional fixtures on lighting stands. The braceless design of these bars leaves unobstructed space for mounting fixtures and the heavy-duty construction supports LED fixtures as well as conventional PAR cans. Simple clamp-on attachment makes set up easy and efficient. These bars work with any standard lighting stand because, unlike O-clamps, the u-mount clamp fits any size of tubing from 1.38" to 1.5" in diameter.