10 x 3/16 x 21/64 Chrome Plated Grade 8 Steel Split Lock Washers (16 pcs.)
Diameter: 3/16Diameter 2: 21/64Thickness: 3/64Material: SteelFinish: ChromeHardness: Grade 8Nominal Size: 3/16 (#10)Style: Medium SplitType: Lock WasherApplication: Nuts and BoltsBox of 16.The purpose for a lock washer is to prevent threaded fasteners from loosening by creating friction between the fastener and the mounting surface.