Durable material: Made of carbon steel, galvanized surface, strong oxidation resistance, not easy to rust, very strong, and can be used for a long time. Flexible design: The parasol frame is suitable for (0-1.5inch) parasol poles of different diameters. 1.5 inch diameter tube with thumbscrew to securely hold the umbrella and allows you to adjust the height. Wide range of use: Large clamp opening can clip anywhere you want (0-1.96 inch), attach to bleachers, benches, tailgates, poles, boats, fences and more. (The maximum clampable thickness is 1.96 inch / 5cm, before buying, please measure the thickness of the clamped object). Easy Installation: The parasol clip can be quickly installed on the railing, and the position can be changed. Heavy Duty: Made of carbon steel, galvanized surface, strong oxidation resistance, not easy to rust, and can be used for a long time. The clamp-on design allows it to be easily installed or taken down without the need for tools. Heavy umbrella clamp attach to benches, tailgates, boats, fences and more. Universal pole: accommodate most 1.5 inch size of umbrella pole. The maximum clampable thickness is 1.96 inch/ 5cm.