How to choose: First remove the old damaged toilet lid knob, measure the inner diameter of the toilet lid mounting hole, our flush button is suitable for mounting in 38mm-50mm round ceramic holes. Type: Toilet Push Button Material: ABS Plastic Feature: Eco-Friendly. Knob Outer Diameter: 50mm / 1.97inch. Thread Diameter: Approx. 38mm / 1.5inch. Screw Rods Length: Approx. 114mm / 4.44inch. Package including: 2 x Toilet Water Tank Push Button. Warm Tips: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. If you have any questions about our products, please contact us in time, we will give you a satisfactory answer within 24 hours Note: The data is manual measurement, please allow an error of 1-154cm, due to differences in light and display, there will be a certain color difference, the specific facts shall prevail.