Cast iron bar strainer measures 3-5/8" in diameter. Measures 5/16 inch in thickness. Meant for use as a 3" flat soil pipe strainer, but has many other uses. This is a bar strainer, so it is a little bit thicker than the strainer floor grates that we have, so be sure to consider the thickness that you need. Unique 3-5/8" size. Suitable for driving and walking traffic. Painted black.