Malibu Square Umbrella Base with Wheels. This outdoor umbrella base features a square base design. The surface is made of iron material treated with a heat transfer printing process, presenting a realistic wood grain effect, which is aesthetically pleasing and harmonizes well with various outdoor environments. The interior of the umbrella base is filled with concrete, providing substantial weight and stability. It can effectively support outdoor umbrellas and ensure they remain stable under various weather conditions. It is equipped with a stainless steel central post, complete with adjustment knobs for easy installation and fixation of the outdoor umbrella pole. The top opening of the post is designed to accommodate various umbrella pole sizes.