Mount on interior or exterior to front, side or back windows-even overhead on a sunroof! Adjustable aluminum hooks bend easily to fit any item; Velcro straps tighten to prevent movement and wear. Insert Radius Reducer to hold gun barrels and small-radius items. Easy on and off, easy to reposition for different types of equipment: cased or uncased guns, scoped rifles, archery equipment, tools, binoculars, etc. Super-strong Suction Cups rated to hold 100 pounds on the Double-Hook Model. There are 5 suction cups on the back of each hanger.