Table gasket

thingiverse

This protective gasket was engineered specifically to safeguard an outdoor glass tabletop hole, cleverly cut into its center, from damage caused by inserting a pole like an umbrella. Its primary function is to shield the glass from chipping or cracking due to such insertions. The gasket was originally designed to fit snugly over a 2-inch wide diameter and 3/8-inch thick glass, allowing approximately 1.5-inch wide umbrellas (and possibly slightly wider ones) to be safely inserted without risking damage to the surrounding glass.