The tapered end of the 8mm shaft on our 43" collapsible umbrella will fit tightly just inside the umbrella holder hardware due to it's octagonal shape. Inserting the tapered end of the 43" umbrella just inside the housing results in positioning the umbrella for maximum spread from the Skylux. All of our standard 7mm umbrellas pair perfectly with the Skylux. Depending on the construction of the shaft, other manufacturer's non-tapered 8mm or larger shaft may not work. The Skylux should accommodate any 7mm shaft umbrella.