Durable construction and weather resistance - The parasol holder is made of forged steel with a black powder coating for rust-proof, weather-resistant performance. The robust build provides excellent stability and wind resistance, keeping the umbrella securely attached even in windy conditions. Adjustable and versatile compatibility - Suitable for balcony railings with a thickness of 0.8 to 2.5 inches. Width can be easily adjusted by turning the screw. - Fits umbrella poles with a diameter of 1 to 1.5 inches and uses an adjustable knob to set the height individually. - Also compatible with other poles such as flag poles, fishing rods, or flashlights. Space-saving balcony solution - Attaches directly to a square railing, saving valuable floor space on the balcony. The floor stays clear and tidy, while you enjoy shade right away. - Mounting on the balcony parapet makes a practical and attractive outdoor decor accessory. Easy installation and quick sun protection - No tools or drilling required. Attach the umbrella holder to the balcony railing, insert the parasol, and tighten the adjustment knob for immediate sun protection. Use scenarios - Balcony or terrace seating area: mount on the railing to create shade without taking up floor space. - Small decks or porches with square railings: keep the floor open for movement while securing the umbrella. - Flexible outdoor setups: use with flag poles, fishing rods, flashlights, or other compatible poles to adapt to different needs.