Windshield Mount"Rubber clamps won't slip or scratch your aluminum window frames" No tools required Just slip over window frame and tighten thumb screw. Fits window frames from 5/8" up to 1 1/4 " thick. Fits pontoon rails up to 1 1/4" thick. Works great on round rails and Biminis.(no zip ties like the competitors) So easy the driver can even run the flag Pivots down below window (No flag flapping noise.) Clamps onto Golf carts, railings, etc.