Prime-Line 3/8 in. x 7/8 in. O.D. Grade 18 to 8 Stainless Steel Flat Washers SAE (15-Pack) 9080044 - The Home Depot
18-8 vs. 304 Stainless Steel - All America Threaded Products
18 oz Double Wall 18/8 Pro-Grade Stainless Vacuum Sealed Big Mouth Water Bottle with Leak-Proof Black Stay-On Cap | Great For Alkaline Water Storage - Stainless Steel - Walmart.com