PACKAGE INCLUDES: This patio umbrella base parts set includes 2 pcs umbrella hole base with inner diameter 4.8cm, 2 pcs umbrella hole base with inner diameter 3.8cm , 2 x 40mm M8 Conventional Threaded Spare Screws; Rich number and combination of styles to meet your needs of umbrella parts replacement Good workmanship: The umbrella holder spare part is mainly made of HDPE plastic, which is wear-resistant and extrusion-resistant, with features of high temperature resistance and weather resistance, the threaded replacement screw is made of quality black plastic and stainless steel, good fixing performance; Not easy to corrosionNote: The size of this product is manually measured, if there is any error, please understand. Good wind stability: 1.5 inch and 1.9 inch 2 sizes of outer umbrella ring, to meet most umbrella pole diameter needs, the corresponding size will be a great clamping umbrella pole; Effectively reduce the wind caused by the shaking of the umbrella; Can also protect your umbrella to prevent the umbrella pole from rubbing, scratching and bumping. Easy to Install: You can choose 2 sizes of umbrella hole covers according to your different diameter umbrella pole, put them together tightly to keep the umbrella stable; Tighten the 40mm M8 thread to replace the handle after installation, adjust the knob to secure to prevent the umbrella from slipping Wide range of applications: these umbrella hole ring plugs conform to the base pole diameters of market standard umbrella; Pole adapters can be installed in most umbrellas for more options in outdoor spaces, such as beaches, backyards, balconies, and poolsides