7/16" x 29/64" x 5/8" Zinc Plated Grade 2 Steel Safety Lock Washers

Diameter: 29/64"
Diameter 2: 5/8"
Thickness: 1/16"
Material: Steel
Finish: Zinc
Hardness: Grade 2
Nominal Size: 7/16"
Style: Safety
Type: Lock Washer

Box of 20.

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