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, Hard to Break, Safe and Firm. Cross Nut Design:Toilet Seat Hinges Fixings uses cross nut to make installation tools easier for you.< /p> Universal Size: The screws are universal for the toilet when they fit through standard toilet holes and/or with Blind Holes. Once tightened, the rubber expands and locks the tablet completely. Easy to Install:They are very easy to install in minutes, just remove the clean old bolts around the area and install the new bolts. Application:The 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. Specification: Material: Rubber Stainless Steel Color: Black Size: As Picture Package Content: 4 Pieces