I purchased this base to use with the Rectangular Twin Market Patio Umbrella - 15x9ft also available on BCP. The base is solid, yet moves easily when needed. The casters lock into place and keep the umbrella in place, it doesnt even sway in light winds. I am very impressed with this base, especially at this price. It was packaged well and was easy to screw in the casters and umbrella went in without any issues. The base does come with 2 other "adapters" that will allow you to use it with a normal sized umbrella pole as well! It looks great and does exactly what I needed it to! Im back on the side purchasing another one of these as well as another rectangular umbrella! HIGHLY RECOMMEND!!