Easy to install-The toilet seat hinge is easy to install, and it takes only a few minutes to easily fix your seat. (For details on the steps, see the third photo). Perfect fit-These fixtures on the toilet seat have a rubber plug, which is more flexible and durable than other plastic plugs, and can be perfectly inserted into the toilet hole. High quality-the toilet hinge is made of high-quality stainless steel and rubber, with a smooth surface, strong and durable, rust-proof, and will serve you for a long time. SIZEThe long diameter of the pin into the chair is 288mm, the base diameter is 6.2mm, and the rubber plug has a long diameter of 3518mm. It is universal and suitable for most toilets. Please check the pin size before ordering.The set includes 4 toilet seat bolt hinges. Product description BUYGOO 4 pieces of toilet seat top fixing hinges 2 pairs of accessories with louver holes expansion rubber screws, 4 pieces with 50 mm base. Features: Easy replacement in minutes For a perfect fit, the rubber bundles slide perfectly into the holes, and when you tighten the screws, they will squeeze into the holes to get a good fit. High-quality materials, rust-proof, sturdy and durable, long service life Material: stainless steel rubber Size: Pin/pin: 28 x 8mm / 1.1 x 0.31in Base: 6.2 mm/2.44 inches Rubber stopper: 35 x 18 mm/1.38 x 0.7 inches Silver Delivery: 4 x toilet seat hinges.