STOP SLIPPING SEAT: If your toilet seat keeps moving, replace the old fasteners with our toilet seat screw fasteners, hold the seat securely and stop sliding on both sides. It is a quick, easy and reliable accessory. Material: The expansion nut is made of high quality stainless steel and nylon, it is used to fix the toilet seat cover and is durable.Nut design: stainless steel does not rust like metal, does not slip easily, does not break easily, and has a longer service life. The universal cross nut offers you great convenience and is easier to install and disassemble. Professional Use: The toilet seat adjustment screw fits most standard toilet seats, and the top hinge allows you to replace worn hinges. It's a quick, easy and reliable accessory. Easy to install: They are easy to assemble in minutes. Simply remove the old screw and insert the new toilet seat screw.