Compatible size and fit: Diameter 38 mm (1.5 inch). Suitable for circular toilet tank holes with a 38 mm diameter. Please check your hole size before ordering. Adjustable length and action: The mounting rod can rotate to adjust length. When the button is not pressed, the total length is 100–125 mm; when the button is pressed, the total length extends to 137 mm. Durable material: Made of quality ABS. Smooth, burr surface, waterproof, rustproof, and resistant to corrosion for longlasting use. Easy installation: Replacement flush button that is convenient to install. old or damaged toilet tank buttons by yourself without the need for additional tools or accessories. Efficient singlebutton design: Singlebutton operation enables quick water discharge with one touch and a strong water output, improving flushing performance. Practical applications: Ideal for replacing wornout or broken flush buttons in 38 mm circular tank holes; suitable for home bathroom upgrades, maintenance in rental properties, or DIY renovation projects.