This part is known as a grease filter and it is used in conjunction with your microwave. The purpose of this filter is to trap grease and other cooking residue from the exhaust air while cooking. The part is 7.5 inches wide by 5 inches deep, is metallic silver in color, and is sold individually. Because the vent hood filter collects grease particles from the air while cooking, we recommend that you thoroughly wipe the area down before putting in your new part. You will not need any tools to make this installation.