When you tighten the screw , it will expand and tighten itself into the hole without the need for a bolt on the other end of the screw The toilet seat hinge fastener is specially designed for fixing the toilet lid , and is applicable to the replacement of back wall or wall mounted Flushs toilet The toilet seat fixings are rubber and metal More and less prone to damage These toilet seat accessories are connects from using a screwdriver , simply place these toilet seat screws into the toilet installation hole Suitable for most standard toilet seat with top fixed hinges Perfect for fixing damaged or old toilet seat top accessories, Manufacturer: Watreketal