Clamping pressure is applied by sliding the locking collar up the tapered body, where it sequentially engages in a series of toothed stops, to lock it in place. Pressing a lever disengages the stops and releases the collar for easy removal. A 1/2" diameter hole allows the clips to be tied to a rope or secured with bungees.
3-1/4" long overall, with a load capacity of over 50 lb. Excellent design, with many uses.