THIS IS ONLY for umbrellas with a hole diameter of 2.17 inches. CHECK THE SIZE BEFORE PURCHASING. Package Includes: 2 sets of outdoor patio umbrella base stand parts. Each set includes one 1.5 inch and one 1.9 inch umbrella hole ring, and one 40 mm long M8 threaded screw. Multiple combination options to fit most umbrella pole diameters. Ideal for stabilizing and aligning patio umbrella bases. Material: Made of HDPE plastic, reusable, sturdy, and safe with high temperature and weather resistance. Threaded knob made of black plastic and stainless steel, resistant to rust and corrosion for long-term use. Widely Used: Helps secure umbrella poles, reduces shaking caused by wind, and prevents scratches or dents from friction. Suitable for use at beaches, backyards, balconies, and poolside areas. Easy to Use: Choose the appropriate size hole cover based on your umbrella pole diameter. Insert securely to keep the umbrella stable. Tighten the M8 40 mm screw after installation and adjust the knob to prevent slipping. Material: Plastic Color: Black Package Contents: 2 Sets x Ring Plug Cover Note: Other items not included. Lighting and display differences may cause slight color variations. Measurement may vary by +/- 1-3 cm.