Size Information: Expansion ball diameter: Approx. 1.8 cm/ 0.7 inch (unexpanded state). Rubber sleeve length: Approx. 4 cm/ 1.57 inch. Metal screws: 4.8 cm/1.89 inch. Metal screw diameter: 0.46 cm/ 0.18 inch. Metal washer diameter: 1.4 cm/ 0.55 inch. Suitable for 14 - 16 mm hole for toilet seats. Matreial: The expansion screw of the toilet seat is made of high-quality rubber, and the screw is made of stainless steel, which effectively prevents rust and is not easy to break, better than most plastic fixtures on the market. Perfect Design: The rubber bungs slide into the holes perfect and when you tighten the bolts they squash up in the holes making a good tight fit. Application: Great for broken or old toilet seat hinges. Suitable for most UK standard size toilet seats with top fix hinge. Easy to Install: The toilet seat screws and fixtures adopts Phillips head, which is easy to install and remove. Screw the toilet seat hinges into the top hole of the toilet lid, and tight that to make the toilet lid will no longer be loose.