The expansion nut is made of high quality nylon and stainless steel screws, which is sturdy and durable for long term use.
You will get 4 pieces toilet seat replacement parts kit, enough for replace a useless toilet seat.
Plastic washers do not rust and are better than metal washers. Anti-slip and anti-rust.
Screw universally fit for most standard toilet seat with top fix hinges, toilet seat holes are from 14 to 16mm.
Simply place the toilet seat bolts into the toilet mounting holes and tighten the screws. Convenience and time saving.