The F&V Lighting Junior Clip has a mouth opening of 1.75" and can attach to both flat and round tubes. It features two integrated female threads: one (1) 1/4"-20 and one (1) 3/8"-16. The Junior Clip tightens via a metal kip lever. Attach a variety of accessories via its available female threads onto poles or stands as needed. The Junior Clip has a reinforced rubber lining on the mouth that allows for a no slip grip. This clip is strong yet small in size and is easily stored in the pocket of your kit bag or clothing.