Dimension - Fits for umbrella pole diameter is 1.5Inch/ 38 mm. The outside diameter at the smallest edge is 1.94inch, the outside diameter at the largest edge is 2.7inch. HOLDS UMBRELLA IN PLACE - Tapered Design keeps the Umbrella properly seated and eliminates any rattles. This umbrella wedge might have a pre-cut seam at one side for better-fit the umbrella pole, and it works fine inside the patio table hole. No more swaying unbrellas on windy days with this patio umbrella cone! EASY INSTALL,REMOVE AND STORAGE - Installs in seconds,just push, twist and turn until it's fully inserted. very easy for storage. Installation: 1. Draw out the umbrella and pole from the hole on the patio table; 2. Install the cone wedge onto the umbrella pole; 3. Insert the umbrella and pole back to the hole on the patio table; 4. Spin and push the cone wedge down gently in order to have it sunk into the hole compactly. (lube, oil might help in doing this) Colour:Brown Material:Rubber Size:Total height . 57.4mm Package Contents: 4 x Patio Table Hole Ring Plugs Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.