3/8" x 1/2" Zinc Plated Steel Wavy Washers

Nominal Size: 3/8"
Inside Diameter: 3/8"
Outside Diameter: 1/2"
Thickness: 1/32"
Material: Steel
Finish: Zinc
Style: Wavy
Type: Lock Washer

Box of 15.

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