【Compatibility】Cross base NOT included. Not suitable for PURPLE LEAF DOUBLE TOP cantilever umbrella. Suitable for cantilever umbrella which included CROSS BASE（Within 39.37 inches long) 【Dimensions】Overall size: 35.43"Length x 34.96"Width x 6.5"Height. Note: If your patio umbrella is NOT buying from us please make sure your cross bar size (39.37"Length x 1.18"Width ) 【High Weight Capacity】 Water and sand can both be injected, the total weight is about 300 lbs with fully injected, so your patio umbrella will be more stable 【Durable Material】 Made of heavy-duty plastic that are weather resistant, UV protected and waterproof 【Easy-to-fill】 Each plate is built with a water port and screw cap, which allows for easy filling of the cantilever umbrella base Please Note: The base is only sold with the PURPLE LEAF umbrella. In order not to affect your shopping experience, if you have never purchased a PURPLE LEAF umbrella and choose to purchase the base separately, we will not ship it to you, because the base may not be suitable for other brands of umbrellas. Please understand.