The McAlpine BWU60SPH-CB is a chrome plated brass basin waste with a backnut model. It has a 60mm flange and a 3 1/2" tail with a swivel handle plug. This type of basin waste is commonly used in bathroom sinks and is designed to allow water to drain out of the basin while preventing debris from entering the plumbing system. The 60mm flange refers to the diameter of the plate that sits on top of the sink, while the 3 1/2" tail refers to the length of the pipe that extends down into the plumbing system. The swivel handle plug allows you to easily open and close the waste, which is useful when cleaning the sink or filling it with water. Overall, the McAlpine BWU60SPH-CB is a durable and reliable basin waste that is designed to last for many years. It is made from high-quality materials and is easy to install, making it a popular choice for both homeowners and plumbers. Available Slotted or Unslotted 1.25" BSP Swivel plug is fixed to the waste body preventing removal or vandalism 60mm flange 3.5" Tail McAlpine BWU60SPH-CB 1.25" Chrome Plated Brass Basin Waste - Backnut Model: 60mm Flange x 3.5" Tail with Swivel Handle Plug in Silver