1/2" x 49/64" 18-8 Stainless Internal Tooth Lock Washers (10 pcs.)

Diameter: 1/2"
Diameter 2: 49/64"
Thickness: 5/64"
Material: Stainless Steel
Hardness: 18-8
Nominal Size: 1/2"
Style: Internal Tooth
Type: Lock Washer
Application: Smaller head screws

Box of 10.

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