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Snail 4 Pcs Offset Umbrella Square Base Heavy-duty HDPE plastic with weather resistant UV protection that prevents color from fading. An easy fill spout on each base plate makes for convenient filling, cleaning, and storage. And this umbrella sand base that works for any umbrella that uses a conventional flanged cross brace base. Specification: HDPE 4-piece base plate set Each fillable plate measures 19.75" x 19.75" x 3" Universal design works with flanged cross brace base Can be filled with either sand or water The 4-pack provides approximately 105 lb weight when filled with water or 130 lb when filled with wet sand NoticeSteel Cross base in the first picture is not included.