Shade Trends 66 lbs. Fiberstone Umbrella Base plays a big role in shielding you from the beating rays of the sun. This is the product that holds umbrellas firmly in place and does so with the simple screw tightening system that secures the pole. Umbrellas up to one and a half inches in diameter can adequately fit in the Shade Trends 66 lbs. Fiberstone Umbrella Base.