SANEI "PH29-40 Rubber Stopper with Chain for Bathtub" Product Overview: This is a rubber stopper with a chain for use in bathtub drains, stopping water by sealing against the inner diameter of the drain. Size: Outer diameter 40mm, bottom diameter 36mm, height 36mm. Chain: A 670mm long chain is included. Materials: Made of brass and EPDM. Thank you for viewing. This item is being sold due to my mother closing her shop. Thank you for your purchase.