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.

Finishing Washer: 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 material that’s too thin to countersink.

Stainless Steel Finishing Washers: Also known as a cup washer: Its purpose is to recess a countersunk screw head where a round finish with great bearing surface is necessary and on a surface of a material that’s too thin to countersunk. The finishing washer is made of 18-8 Stainless Steel for good corrosion resistance.