Material - The toilet seat screw is made of high quality stainless steel and rubber, good fixing effect, not easy to break and has a longer service life. Lock design 39;nut - Both a flat-head screwdriver and a cross-head screwdriver can be used, provide you with great convenience and are easier to install and disassemble. Easy to install - Just insert the nut seat screws toilet into the toilet mounting holes and tighten the screws, and finally no more wobbly toilet seats. Dimensions - The toilet seat expansion screw is 4 cm high, 2. 2cm wide at the top and 1.3cm wide at the bottom, suitable for 13-18mm hole for 2 toilet seats. Universally suitable - Fits most toilet seats at standard fixed hinge. Color: Black Shipping quantity: 4 pieces Note: 1. Please allow error due to manual measurement. Thank you for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.