General description These balcony parasol accessories include 6 pieces designed to stabilize and align parasol feet on patio tables, balconies, and patios. The set consists of 4 umbrella hole rings and 2 hand knob screws, suitable for various pole diameters. Technical specifications Color: Black Material: High-quality plastic and stainless steel Umbrella hole ring sizes: 1.5 inch and 1.9 inch Threaded screw size: 40mm M8 Installation Select the appropriate umbrella ring size based on the pole diameter. Insert the umbrella pole into the base. Tighten the M8 threaded screws to secure the umbrella and prevent slipping. Detailed installation steps are available in the instructional photo. Usage Compatible with standard pole diameters on the market. Ideal for use on patio tables, beaches, backdrops, gardens, balconies, decks, and pool edges. Other information Includes 2 sets (4 pieces) of umbrella hole rings and 2 hand knob screws. Two umbrella base tube sleeves in 2 sizes can fit together