Clear polycarbonate plate guard prevents food from being pushed off the plate. Internal V groove attaches to the rim of the plate. Small size fits plates with a diameter of 6 to 8 inches. Large size fits plates with a diameter of 8 to 9 inches. Dishwasher safe to 125 degrees. Plate guard attaches by stretching open and placing rim of plate into the 'V' groove of the Clear Plate Guard. Spring like qualities will keep it securely on the plate.