Features: 6-Piece Patio Umbrella Base Parts Includes 2 1.9" ID Umbrella Hole Bases, 2 1.5" ID Umbrella Hole Bases, and 2 M8 40mm/1.57" Threaded Replacement Screws. Made of high-quality plastic, resistant to wear, high temperature and weather, durable, good screw tightening performance, especially suitable for outdoor use. 1.5 inches & 1.9 inches, meet the diameter requirements of most umbrella poles, can effectively reduce the shaking of the umbrella, and prevent scratches caused by friction with the umbrella pole. Installation is simple, convenient and fast, tighten the M8 40 mm thread screw, adjust the knob to fix. Widely used for outdoor umbrellas in beaches, decks, backyards, balconies and poolside. Specifications: Material: Plastic Color: Black Umbrella Cover: Diameter: about 3.8cm/1.5" Diameter: about 4.8cm/1.9" Quantity: 6 Pieces/set Package Includes: 2 Pieces 1.5inch Umbrella Hole Base 2 Pieces 1.9inch Umbrella Hole Base 2 Pieces M8 40 mm Threaded Screws note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.