The Frankford 50 lb. Steel Round Base Plate is designed solely for use beneath a table and is perfect for 7.5 - 9 foot umbrellas. The slim profile offers a sleek, upgraded appearance without taking up too much space.It accommodates a 1.5" diameter umbrella pole. The 50 lb. Steel Round Base Plate by Frankford is the perfect accessory for you 7 1/2 to 9 foot umbrella.