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 Firm. Cross Nut Design Toilet Seat Hinges Fixings uses a cross nut to make it easier for you to use installation tools. Universal Size Screws are universal for the toilet when they fit through the holes of standard toilets and / or with Blind Holes.Once tightened, the rubber expands and completely blocks the shelf. Easy to Install They are very easy to install install in minutes, simply remove the clean old bolts around the area and install the new bolts. Application Toilet accessories are suitable for most sizes of toilet seats. act as toilet covers made of solid wood, resin or panels of medium density fibers, you can use our hinges.