Premium finish mounting spacer kit for thin sinks. Includes finished spacer and mac washer. Allows regular brass drains to be used with think sinks or sinks without overflows. For use with all Westbrass drains except 410E. PVD* lifetime finish. (*Physical Vapor Deposition: An advanced plating process where chemical reactions between vaporized zirconium, nitrogen and other gases form a permanent, durable surface which will not tarnish or discolor). You"ll be able to appreciate both the beauty and performance of this item for years to come thanks to superior quality finishing and solid brass construction.