These are pressure fit glides and will require force to install since they stay in by pressure. These are the most common type of outdoor furniture glide you will see. Made for wrought iron outdoor furniture with a 1-1/2" or 1-1/4" inside diameter cup on the bottom of the table and chair legs.
There are two types or versions. Standard and Deluxe.The Deluxe model is thicker, longer lasting and easier to install.
Measure your "inside" diameter of your chair or table foot cup to make sure you order the correct size.