Like an off label drug I used 7 pieces to cover the ends of the 7 3/4" x 1/2" rectangular spikes. which support the 7ft table screen we just bought. 7 rectangular ribs are placed in sewn round pockets evenly spaced around the edges of the peak. Over time, the rectangular ribs will rub through the pockets as you open and close the umbrella. Round cushions on the chair legs prevent this. Inexpensive and still works. Added a photo for clarity
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