HIGH QUALITY: The toilet seat fixings are made of rubber and the screws are made of 304 stainless steel, much better than plastic fixings. Dimensions: Rubber bracket: 40 mm / 1.57 inches, metal screw: 50 mm / 1.96 inches, fits most UK standard size hinged toilet seats. Fits 14-16 mm holes. Easy installation: The rubber washers in the set are threaded, so you simply push them into the holes at the top of the toilet. As you tighten the screws, they expand and narrow the holes. You don't need to insert a screw at the other end of the screw. Works very well: The brass nuts are non-slip and rust-proof. With these toilet seat hinge screws, you don't need to tighten the screws from below. These rubber toilet seat screws provide excellent friction on the ceramic holes of the toilet, providing superior grip compared to plastic. Scope of delivery: 4 x rubber caps, 4 x metal washers, 4 x plastic washers, 4 x screws.