5/8" x 11/16" x 15/16" Zinc Plated Grade 2 Steel Safety Lock Washers

Diameter: 11/16"
Diameter 2: 15/16"
Thickness: 5/64"
Material: Steel
Finish: Zinc
Hardness: Grade 2
Nominal Size: 5/8"
Style: Safety
Type: Lock Washer

Box of 8.

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