Beduan 1/2"ID x 1"OD Flat Washer, Stainless Steel 304 Plain Finish, Nominal Thickness (Pack of 110): Amazon.com: Industrial & Scientific
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
Amazon.com: No 6 Stainless Cup Countersunk Finish Washer, (100 Pack) - Choose Size, by Bolt Dropper, 18-8 (304) Commercial Grade Corrosion Resistant Stainless Steel : Industrial & Scientific