Materials: Black rubber (stretch ball), ABS plastic (round cards), stainless steel (screws). Made of strong metal hinges and bolts, much better than most plastic fasteners on the market. Plastic trays do not rust like metal.\nFeatures: Universal size, toilet seat screw hinge fits 14-18mm hole. It is ideal for broken or old toilet seat hinges and fits most standard toilet seats with a top hinge.\nEasy to install: Easy to assemble in minutes. Just remove the old screws and insert new screws for the toilet seat. The compact design makes it easy to install, remove and clean.\nApplication: Installation screws and bolts fixed, convenient and practical, universal toilet lid fixing screws, suitable for bathroom toilet lids\nWarm tips: Before buying, remove the old screws and compare the size with the new replacement hinge set. See picture. For your old toilet seat to work correctly, the new replacement must be the same size.