Strong and Durable: The toilet seat hinge fasteners are made of rubber and 304 stainless steel. The rubber sleeve design improves dirt and wear resistance, with a significant expansion effect. They are not easy to break and provide excellent strength and durability. Wide Application: These toilet seat hinge fasteners are specially designed to fix the toilet seat, compatible with most standard toilet seats with top-mounted hinges, suitable for hole diameters of 14-18mm. Please check the product dimensions and specifications before purchasing. Toilet Seat Fastener: You will receive 2 pieces of toilet hinge fasteners, including expanding rubber bolts, nuts and washers, practical for daily use. (The diameter of the studs is about 8mm, length 28mm, expanding rubber bolts 4.8cm long). Notes: The round hinge plates reinforce the stability of the screws in the toilet hole. When tightening the bolts, the washers will press into the hole, so it is important not to overtighten to avoid damaging