Enhance your outdoor experience with our versatile umbrella base. Easily fill it with water or sand via the injection hole for stability. Designed for mobility, it features 4 casters, 2 of which lock for added security. Built-in handles ensure convenient portability. Crafted from high-strength Pe material with a bottom concave hole for increased surface hardness. Includes a tightening knob to secure umbrellas with 1.25" or 1.9" pole diameters. Ideal for patio, poolside, or tennis court use, with a capacity up to 54 lbs of sand or 36 lbs of water. Simple assembly with minimal accessories required.