Diameter: 17/32"
Diameter 2: 3/4"
Thickness: 5/64"
Material: Steel
Finish: Zinc
Hardness: Grade 2
Nominal Size: 1/2"
Style: Safety
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.