The McAlpine BSWCLS-OFSS 1½" Basket Strainer Waste and Overflow is a plumbing accessory used in sinks or baths. Here are the features of this product: Basket strainer waste and overflow: The unit functions as both a strainer and overflow for your sink or bath. The basket strainer prevents food scraps or other debris from clogging your pipes, while the overflow helps prevent flooding if the water level rises too high. 113mm Stainless Steel Flange: The flange is the visible part of the unit that sits on top of the sink or bath. The McAlpine BSWCLS-OFSS features a 113mm stainless steel flange, which is durable and resistant to corrosion. Spring-Loaded Plug: The spring-loaded plug is a mechanism that allows you to easily open and close the waste outlet of the unit. This makes it easy to drain water from your sink or bath when you need to. Chrome Plated Overflow Grid: The overflow grid is the part of the unit that allows water to flow out of the sink or bath if the water level gets too high. The McAlpine BSWCLS-OFSS features a chrome-plated overflow grid, which is both durable and attractive. Centre Pin Model: The centre pin model means that the overflow grid is secured to the unit by a central pin. This is a common design for basket strainer waste and overflow units. Overall, the McAlpine BSWCLS-OFSS 1½" Basket Strainer Waste and Overflow is a high-quality plumbing accessory that combines functionality and durability. ・ 1½" BSP ・ 113mm Stainless Steel flange ・ Spring Loaded Plug ・ Supplied with 41mm fixing ferrule ・ Longer fixing ferrules available as follows: 70mm long Code: BRBOLT70 and 90mm long Code: BRBOLT90