- 3/4" Flat Stem Bumper - Bumper fits a 1/4" hole - Made to fit solid or tubular flat surface patio furniture chair frame - prevents scratching on stackable furniture - Bumper measures 1/2" long without the head (5/8" with the head) - 1/2" stem length (inserts into 1/2" depth) - Diameter of the head measures 3/4"