Filled with water these weights were perfect for keeping my umbrella upright. The individual pieces fit nicely between the metal stand but I am only able to connect three together with the metal locks provided ( this does not interfere with function or looks of product). The only negative is that water pools on the base after a rain. It eventually evaporates or you can wipe it dry.
Arrived quickly, and placing the pieces was easy enough to do. Using water offered enough weight to keep the umbrella steady. Don’t like the size (didn’t realize until we purchased a cantilever umbrella just how much room the base would take up), that you see the connecting pins, that seeing that much plastic on my patio would bother me so much, or that it would be near impossible to move, but it was accurately described and does what it needs to do.