1/2" x 7/8" Black Chrome Plated Grade 2 Steel Lock Washers

Diameter: 1/2"
Diameter 2: 7/8"
Thickness: 1/8"
Material: Steel
Finish: Black Chrome
Hardness: Grade 2
Style: Medium Split
Type: Lock Washer

Box of 6.

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