This outdoor umbrella holder is easy to install and remove. It can fit umbrella poles with a diameter ranging from 0.79 in. to 1.7 in. You just need to wrap it around the balusters of the railing and tighten the through-bolt, and it can be installed without causing any damage. It can provide you with sun protection and rain shelter as needed anytime and anywhere, completely getting rid of the traditional umbrella stands that require filling with sand or adding weights.It is suitable for scenarios where the thickness of the vertical railing grille is between 3/4 in. and 2 in. , and the distance between the vertical balusters is between 2 in. and 7 in. The umbrella base is made of heavy-duty stainless steel material, which is treated with a high-temperature powder coating, having excellent waterproof and rust-proof properties.The rubberized anti-slip pad of the holder can not only firmly fix the umbrella on the railing but also prevent the railing from being scratched. Its innovative design is extremely space-saving. Whether it is on the deck, by the pool deck, on benches, bleachers, at the tailgate, on boats, on poles, or on fences, it can play its role, bringing coolness and shade to the outdoor space, and at the same time, it will not crowd the guests or take up precious floor space. Color: Black. Material: Metal.