High Quality Material The shell of the toilet seat screw is made of high quality rubber, and the inner screw is made of stainless steel, which is not easy to rust, non-slip, not easy to break, safe and Close. Cross Nut Design Toilet Seat Fixings Hinges uses a cross nut to make it easier for you to use the installation tools. Universal Size The screws are universal for the toilet when they fit through holes in standard toilets and/or with Blind Holes. Once tightened, the rubber expands and completely blocks the tablet. Easy to Install They are very easy to install in minutes, just remove the old clean bolts around the area and install the new bolts. Application Toilet accessories are suitable for most sizes of toilet seats. Whether it’s solid wood, resin or MDF toilet covers, you can use our hinges.