1. material: the parasol holder for the balcony is made of high quality forged steel, which is extremely stable and durable. The robust construction provides excellent stability and wind resistance. Thanks to the black powder coating, the parasol holder is rustproof and weatherresistant even in windy weather, the umbrella remains securely attached. 2.Adjustable Design This parasol bracket for balcony railing is suitable for railings with a thickness of 0.82.5 inches. The width can be easily adjusted by turning the screw. It fits umbrella poles with a diameter of 11.5 inches. Ideal for parasols, flag poles, fishing rods, flashlights or other poles. 3.Practical and spacesaving: unlike conventional, bulky parasol stands, this balcony parasol holder can be attached directly to the square railing saving you valuable space on the balcony. The floor remains and tidy. Simply mount on the balcony parapet and immediately enjoy the pleasant shade. A perfect accessory to complete your outdoor decor and add comfort to the outdoors. 4.Easy to install: the parasol attachment for the balcony can be installed in minutes without tools or drilling. Simply attach the umbrella holder to the balcony railing, insert the parasol and tighten with the adjustment knob. So you get effective sun protection in no time at all.