Product includes: 3 umbrella hole rings, 1 oblique support tube and 2 M8 star-shaped thumb screws. Ideal for stabilizing and adjusting patio umbrella bases. Product size: The umbrella hole ring has 3 sizes: inner diameter 1.9", 1.5" and 1.3" (mountable). The M8 star-shaped thumb screw is 20mm/0.79" long, suitable for most umbrella pole diameters. The corresponding size is perfect for tightening the umbrella pole, which can better protect your outdoor umbrella. High quality material: The umbrella base accessories are made of high quality plastic, sturdy and durable. They offer good resistance to extrusion, high temperature and weather resistance. The replacement screws have good fixing performance, are made of high quality plastic and stainless steel, are sturdy and not easy to break. Easy Installation: Use the umbrella ring according to the pole diameter, insert the pole into the base, tighten the M8 star knob, and secure the umbrella to prevent it from slipping. Wide Application: