#6 x 9/64" x 19/64" 18-8 Stainless Internal Tooth Lock Washers LWSS-069 (40 pcs.)

Diameter: 9/64"
Diameter 2: 19/64"
Thickness: 1/32"
Material: Stainless Steel
Hardness: 18-8
Nominal Size: #6
Style: Internal Tooth
Type: Lock Washer
Application: Smaller head screws

Box of 40.

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