Description Black and Chrome Dual Flush Toilet Top Button (48mm) Design: Dual Flush Button, Round Shape Connection Diameter (Size hole in Toilet-Porcelain): 48mm Material: Chrome Plated Plastic 48mm Dual Flush Button is designed to mount on top of toilet tank. Release the Water in Toilet Tank 4.5-inch long rods- can be cut to shorter length if necessary How to Choose the Right Size Button for Your Toilet- Video