Fixed Plug-in Extension Screws for Toilet Lid Circular White Plastic Board Diameter: 2.8cm/1.1’’ Ball Diameter of expansion: 1.7cm/0.67’’ (unexpanded state), Length 4cm/1.57’’ Material: Black rubber (expandable ball) / ABS plastic (round cards) / Steel stainless steel (screws) Package included: 1 pair of screws