High quality material The expansion ball is made of high quality black rubber and the long screw is made of stainless steel. Sturdy, rust and corrosion resistant. Less slippery, less likely to break , longer life, better than most plastic ties. Easy to UseEasy to assemble in minutes. Screw the toilet seat hinge into the hole at the top of the toilet lid, then tighten the expansion screw into the hole to prevent the toilet lid from loosening. Perfect FitThe rubber plugs slide snugly into the holes, and when you tighten the screws, they push into the holes for a tight fit. Excellent toughness and stability to protect your toilet lid. ApplicationSuitable for 14-19mm toilet seat hole. Toilet seat accessories are available for damaged or old toilet seat hinges. Fits most standard toilet seats with fixed upper hinges. Excellent toughness and safety, strong and durable toilet seat. Fits most standard toilets, ideal for broken or old toilet seat hinges. Quick and easy, just carefully remove the old bolts around the area and install new ones. Rubber cover: 6.4 cm or 2.52 inches Metal screw: 8 cm or 3.15 inches