Material: Rubber(Expanding Ball)/ABS Plastic(Round Cards)/Stainless Steel(Screw) Size: Expanding Ball Diameter: 1.8cm/0.7inch (unexpanded state ) Length: 4 cm / 1.57 inch. Suitable for 14-16mm hole for 2 toilet seats Universal fit:Fits most standard toilet seats with top hinge Easy to install:The rubber grommets in the kit have a threaded section so you can just push them into the holes at the top of the toilet bowl and when you tighten the screw it expands and tightens in the hole, no need for a bolt to the ;other end of the screw Wide applications: ideal for broken or old toilet seat hinges