7/16" x 21/32" Zinc Plated Steel Wavy Washers

Nominal Size: 7/16"
Inside Diameter: 7/16"
Outside Diameter: 21/32"
Thickness: 3/64"
Material: Steel
Finish: Zinc
Style: Wavy
Type: Lock Washer

Box of 12.

The purpose for a lock washer is to prevent threaded fasteners from loosening by creating friction between the fastener and the mounting surface.