Material: The toilet seat extension bolt is made of high quality rubber and the screw is made of stainless steel. Stainless steel does not rust like metal, does not slip easily, does not break easily and lasts longer. Dimensions: the toilet seat extension screw is 4 cm high, 2.2 cm wide at the top and 1.3 cm wide at the bottom. Suitable for installation hole diameter 1.3-1.8cm. Nut-shaped design: one word, universal Phillips nut, give you great convenience and can be installed better and disassembled. Easy to install: just insert the screws of the toilet seat into the mounting holes of the toilet and tighten the screws. Convenient and time-saving. Wide range of uses: Suitable for toilet bowls with 1.3-1.8cm installation holes. Product Features: Material: rubber (stretchable); screws (stainless steel). Dimensions: height 4 cm, upper width 2.2 cm, lower width 1.3 cm. Colour: black. Features Very easy to install in minutes, just remove the old bolts to clean around the area and insert the new one. Contents: 4 rubber expansion bolts. lucky meet Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and d display, there will be a certain color difference, the actual object received shall prevail.