Universal Kit: This product includes 3 pairs/6 toilet seat replacement kits in different sizes. The detailed dimensions of each toilet seat nut are shown in the picture. Please measure before purchasing to ensure your toilet seat works properly. High quality material: elastic ball (rubber) / round card (ABS plastic) / screw (stainless steel); rust-proof and corrosion-resistant, can be used for a long time. How to use: insert the screw of the toilet seat into the mounting hole of the toilet, the rubber seal has a part threaded, just push it into the hole on the toilet top, they will expand and screw into the hole themselves, which is convenient and time-saving. Universal attachment: These toilet seat fixings fit 14-18mm holes and are perfect for broken or old toilet seat hinges. Fits most standard toilets. Ideal for top mounted toilet seats and wall brackets. Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference of light and display, there will be a certain color difference, depending on the physical object received Delivery Quantity: (according to the main image)