Widely used:Toilet seat bolts expanded ball diameter: 1.7 cm / 0.7 inch (unexpanded state). Length: 4 cm/1.57 inches. Suitable for 14-16mm holes of 2 toilet seats. Very suitable for damaged or old toilet seat hinges. Fits most standard toilet seats with top fixed hinges. Made of rubber and metal, better than most plastic clamps on the marketOverview: Excellent material-black rubber (expansion ball) / stainless steel (round card) / stainless steel (screw). Toilet seat bolts made with strong metal hinges and bolts, it is better than most plastic fixtures.Easy to install: toilet replacement parts the rubber washers in the kit have a threaded part, so you can push them into the hole on the top of the toilet bowl, when you tighten the screw, it expands and tightens into the hole without having to screw on the other Bolt. The end of the screw.Toilet seat tightening kit Product specifications: rubber sleeve: 40mm / 1.57in, metal screw: 48mm / 1.89in, stainless steel washer: 16mm/0.63in