Pole-R-Bear Handy Umbrella Hooks — 'With a name like that they'd better be good'

From the website:

Pole-R-Bear Handy Umbrella Hooks

Slips over your beach umbrella pole so you can hang up wet towels, tote bags, T-shirts, etc., to keep them shaded and sand-free.

Fits most standard umbrella poles and includes adapter for smaller sizes.

Rubber collar with 4 rubber-coated, stainless-steel hooks.

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$12.99 (umbrella not included).