Actual diameter of the glide is 1.42” or 36mm. Made for 1-1/2" inside diameter cups. There will be a little space around the edge when used on a 1-1/2" cup. If your inside diameter is 1-1/4" that is a seperate size which is sold separately. | Self-leveling replacement chair and table feet ensure even contact with the floor. | Made in the USA out of a durable Delrin material. The original Forever Glides last longer than a typical plastic glide. | Wrought Iron patio furniture replacement feet prevent scrapes, damage and rust marks on your patio and deck surface. Will not leave marks on your flooring. | Each package includes 24 high quality long lasting patio furniture foot glides and 24 pieces of double-sided waterproof adhesive foam.