Installatonsize: Our pop up tub drain plug fits most freestanding tubs. Drain Cover Diameter 2.75", Height Popped: 4", Height Closed: 3.6", Male Thread Diameter: 1-7/8", Fits 1-1/2" Drain Pipes. Product material: The bathtub drain body and cover are integrally formed of solid brass material, which is durable, firm and anti-corrosion. The bounce core is made of fatigue-resistant stainless steel spring material for long-lasting performance. Surface treatment: It adopts multi-layer polishing and electroplating process, which is smooth and shiny, and the surface is protected by coating. Even if it is used for a long time and frequently, it can maintain a new appearance, and it is easy to clean. No-Leak Design: This freestanding bathtub drain plug has multi-layer sealing rubber pads, which ensure that water will not leak from the bathtub when installed and locked. The pop-up drain plug sealing ring is made of soft rubber. When the drain plug is closed, it will not leak, ensuring that there is always water in the bathtub and providing you with a comfortable bathing experience. Easy to use: The pop-up bathtub drain plug pop-up design can easily control the water in the bathtub, and you can easily press it with your toes without bending over