The Hillman Group 2905 Number-6 Stainless Steel Finish Washer, 40-Pack Save when you buy the 2-Pack! Finish Washers are designed to accommodate the heads of a countersuck screw in order to provide a finished appearance Prevents a nut, bolt or screw from pulling through the material Stainless steels are used for their corrosion resistance, high-temperature strength, scaling resistance, and low-temperature toughness