Kupo Quick Action Jr. Pipe Clamp is built by heavy-duty gravity casting designed for rigging on pipe with diameters from 25mm (0.9") – 55mm (2.1"). Features an unique quick action locking device which allows to tighten or loose the knob just in a snap. The telescopic column is available for hanging lighting fixture by penetrating any pipe with max dia. 35mm in horizontal or vertical direction. The 28mm ( 1-1/8") stud can be also locked up for directly hanging a lighting fixture or any gear comes with a 28mm (1-1/8") stud.