Outdoor Umbrella Essential: This square fillable umbrella base with four wheels is suitable for umbrellas when used through an outside garden table or freestanding in a wind-free position. It provides a solid base with smooth castors for compatible umbrellas to move to the needed position Strong Metal Structure: This portable square patio umbrella base is made of powder-coated iron with high hardness and weather resistance. The metal construction does not break or fracture easily to fit in an outdoor environment All-weather Coating: This fillable patio umbrella base is nicely treated with water and scratch-resistant powder coating that is against all kinds of weather. The color does not come off no matter under strong sunlight exposure or humid weather Stable and Secure: Two thumb screws are included to tightly fix the patio umbrella to this portable base stand after inserting the parasol pole into the central tube, ensuring the umbrella remains firmly in place and stands steadily and securely Versatile: With a textured surface in a natural earthy tone, a square, rounded shape, a hollow design, and smooth wheels, this square fillable outdoor umbrella base securely supports your parasol while allowing easy mobility. It also blends seamlessly into your outdoor space as a stylish accent