This listing is for a Pack of 1 1 1/2 inch BSP thread (Please note that most plumbing threads are stated in BSP (British Standard Pipe) terms which differ from actual measurements. As a general rule the actual diameter of a BSP thread is approximately 1/4 inch greater than that stated. For example, this 1 1/2 BSP thread actually measures approximately 1 3/4 inches) unslotted sink waste unslotted click clack basin waste slotted and unslotted basin waste, Weight: 0.66 Pounds, Manufacturer: Macdee