Kupo Quick Action Pipe Clamp is designed for rigging on a pipe with diameters from 25mm (0.9") ‒ 55mm (2.1"). Features an unique quick action locking device which allows you to tighten or loosen the knob in just a snap. The telescopic column is available for hanging a lighting fixture by attaching any pipe with max dia. 35mm in vertical and max dia. 30mm in horizontal direction. The 28mm (1-1/8") stud can be also used for directly hanging a lighting fixture or any gear with a 28mm (1-1/8") stud.