The F&V Lighting Kai 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 Kai Clip tightens via a Kip Lever. Attach a variety of accessories via its available female threads onto poles or stands as needed. This clip is strong yet small in size and is easily stored in the pocket of your kit bag or clothing.