【4-piece toilet seat set】- The toilet seat includes 2 pairs of toilet seat accessories. 【Product size】- The toilet seat is composed of a silicone sleeve and stainless steel screws, the silicone sleeve is 40mm long, 18mm wide, the silicone gasket is 28mm in diameter, the screw is 48mm long, 5.7mm in diameter and the joint is 14mm. 【Universal Size】 - The screw fits toilets when going through a standard toilet hole and/or with a blind hole. When tightened, the rubber expands and completely locks the shelf. 【Easy to Install】- The toilet seat fixings are very easy to assemble, truly universal, installs in seconds , no problem. 【Premium Material】- Flip-up glasses are of high quality with smooth surface. The screw has good hardness and is not easy to break.