The Frankford Solar Reflective Clamp-On Beach Umbrella clamps onto your favorite beach chair. This clamp-on will attach to any tube or flat surface up to 1.5 inch thick. The clamp has 3 positions attachment - horizontal, vertical and diagonal. Enjoy convenient and portable UPF 50+ sun protection. Take this umbrella with you anywhere, the beach, park and sporting events, anywhere the sun goes, the Frankford Solar Clamp on Beach Umbrella goes with you.