Brass Flat Washer, Plain Finish, DIN 125, Metric, M10 Screw Size, 10.5 mm ID, 20 mm OD, 2 mm Thick (Pack of 25): Amazon.com: Industrial & Scientific
500pcs) DIN 125 M10 Flat Washers (10.5mm ID) Type A AISI 316Ti Stainless Steel, Ships Free in USA by Aspen Fasteners, ASSP01254571105: Amazon.com: Industrial & Scientific