Brass/Nickel Countersunk Finishing Washers: Also known as a cup washer. Its purpose is to recess a countersunk screw head where a round finish with greater bearing surface is necessary and on a surface of a material that’s too thin to countersink. The finishing washer is made of a solid brass and generally used in marine applications or where corrosion is a problem.
WARNING: Brass Fasteners can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling! For more information go to www.P65Warnings.ca.gov