Finishing washers, also called trim or cup washers, are ideal for increasing the load bearing surface under a fastener&';s head by distributing the load. Perfect for use with flat or oval head screws, the sunken design gives a clean and decorative appearance as well. The call- out size is the inner diameter of the washer. Washers have a stainless steel finish for superior corrosion and rust resistance, making them ideal for marine applications.