#4 x 7/64" x 13/64" Zinc Plated Grade 2 Steel Split Lock Washers

Diameter: 7/64"
Diameter 2: 13/64"
Thickness: 1/32"
Material: Steel
Finish: Zinc
Hardness: Grade 2
Nominal Size: (#4)
Style: Medium Split
Type: Lock Washer
Application: Nuts and Bolts

Box of 100.

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