Material: Galvanized metal surface, strong oxidation resistance, not easy to rust, suitable for outdoor use. With the help of the umbrella holder, you can easily attach a parasol, garden parasol, flagpole and more to the balcony or table. Suitable parasol: Suitable for parasols with a diameter of up to 38 mm. The umbrella holder can be quickly and easily attached to balcony railings with a thickness of up to 5 cm. No drilling required. Can be quickly installed on the railing and can change the position. Features: The metal parasol holder is ideal for stable and secure attachment of parasols to the balcony railing. The balcony railing umbrella holder replaces a heavy and bulky umbrella stand that takes up a lot of space. Widely Used: This clamp holder is suitable for outdoor use such as camping, fishing, outdoor work, and can also be placed on a variety of objects, including benches, tables, fences, chairs, docks, boats, pontoons, flower beds, stands, railings, decks, balconies,