【HIGH QUALITY】The toilet fixings are rubber and the screws are 304 stainless steel, much better than plastic fixings. 【Cut】Rubber Lid: 40mm / 1.57", Machine Screw: 50mm / 1.96", Fits most UK standard size toilet seats with top fixing hinges. Suitable for 14-16mm holes. 【Easy to install】The rubber washers in the kit have threaded parts, so you just need to push them into the hole on the top of the toilet, when you tighten the screw, it will expand and screw into the hole by itself, not need a bolt on the other end of the screw. 【Easy to use】 The brass nut can be anti-slip and anti-rust. You don’t need to tighten the screws from the bottom with these toilet seat hinge screws. These rubber toilet seat bolts provide plenty of friction against the holes in the ceramic bowl, so they have excellent grip compared to plastic.