This listing is for a Pack of 1 Important Sizing Note - Most plumbing products are measured using BSP thread dimensions which measure 1/4 inch larger than that stated, therefore the 1 1/2 Inch BSP thread this bath waste washer is made to work with actually measures 1 3/4 Inch in diameter. If the waste thread measures 1 1/2 Inch in diameter then you require the 1 1/4 Inch version of this product To help seal a bath waste with a 1 1/2 BSP thread Metric equivalent outside diameter - 71.5mm, metric equivalent hole diameter - 49mm (for information only - metric threads are not compatible with BSP threads), thickness - 1.5mm Material - Plastic