316 Stainless Steel Finishing Cup Washers Marine Grade 316 Stainless Steel Suitable for Harsh Environments - Including Salt Water Commonly used with Countersunk Screws or Bolts such as Oval or Flat Heads to Create a Smooth Finished Look Available in Inch Sizes #4 through #14 (1/4") Raised Washers to Run Flush with the Installed Screw Head