Package includes: 4 umbrella rings and 4 caps; Heating product before installing makes installation easier Standard size: inner diameter: umbrella rings: 1.65 inch, cap: 1.65 inch; Outer diameter: umbrella rings: 2.4 inch; cap: 1.85 inch; Suitable for a 2 inch hole in a glass or acrylic top measuring Material: the umbrella hole ring plug and cap set is made of silicone, soft and reliable, not easy yellowing Function: the umbrella hole ring plug can prevent scratches and dents on umbrella pole caused by friction with the patio table, and reduces umbrella swaying caused by wind Wide application: the table umbrella hole ring is great for coffee shop, bar, milk tea shop, yard or other glass outdoors patio table