Hillman 18-Count #6 Stainless Steel Finishing Washer in the Finishing Washers department at Lowes.com
Amazon.com: Finishing Cup Washer Black Oxide Stainless Steel Countersunk Finishing Washers #6 (0.176 ID x 0.434 OD x 0.087 Thick) QTY 100 : Industrial & Scientific
4Bros Colored Anodized Aluminum Finishing Washers - Set of 4
Prime-Line #8 Grade 18-8 Stainless Steel Countersunk Finishing Washers (100-Pack) 9083692 - The Home Depot
Amazon.com: Finishing Cup Washer 316 Stainless Steel Countersunk Finishing Washers #10 (0.251 ID x 0.603 OD x 0.104 Thick) QTY 100 : Industrial & Scientific