Excellent toughness, safe, strong and stable screws for the toilet lid. Fits most standard fixed hinged toilet seats. Specifications: Material: black rubber (extendable ball) / ABS plastic (round) / stainless steel (screw); ABS extension + ABS protective film (nylon + brass nut). How are the toilet seat hinge fasteners installed? 1.First insert the rubber nut into the holes. 2.Insert the screws into the washer and the plastic plate into the rubber expansion nut. 3. Tighten the screw and cover the stainless steel base. 4. Align the pin and insert it into the hole in the toilet lid. Package includes: 4 extension screws 2 ABS extension + ABS protective film 6 metal discs 4 screws < br / > Note: Make sure to compare the size of your old toilet screws with ours before purchasing! < / P>