How to choose: Start by removing the old damaged toilet lid knob. Measure the inside diameter of the toilet lid mounting hole. Our flush knob is suitable for mounting in 38mm-50mm ceramic round holes. Type: Toilet push button Material: ABS plastic Feature: Eco-friendly Outside diameter of the button: 50mm Thread diameter: approx. 38mm Length of screw rods: approx. 114mm Package includes: 2 x Toilet Water Tank Push Button Warm Tips: Due to the light and screen setting differences, the item's color may be slightly different from the pictures. Please allow slight dimension differences due to manual measurement. If you have any questions about our products, please , and we will provide a satisfactory answer within 24 hours. Note: The data is from manual measurement; please allow 1-4mm error. Due to differences between lighting and screen settings, there may be some color variation. The actual product takes precedence.