At 3 ½ inches, it fits all Bristol Stainless Steel Sinks. Note: All Bristol Sinks come with standard strainers, however, additional strainers are available for sale. "Practical and contemporary, our standard stainless steel strainers are made to withstands the test of time. Bristol offers a range of accessories to perfectly complement your Bristol kitchen sinks. At 3 ½ inches, it fits all Bristol Stainless Steel Sinks. Note: All Bristol Sinks come with standard strainers, however, additional strainers are available for sale."