Grosfillex Sandstone Market Umbrella Base, 70 Pound -- 1 each.70-pound cement filled resin umbrella base. Molded anchor bolt holes to secure base to deck for extra stability. Long, reinforced stem with two thumb screws specifically designed for market umbrellas with 2 inch pole - can be retrofitted to accommodate a 1 1/2 inch pole. Will not rust or mark your deck. U.V. resistant and easy to clean with soap and water.