1-1/4" x 1-3/8" x 3" Zinc Plated Grade 8 Steel Lock Washers

Diameter: 1-3/8"
Diameter 2: 3"
Thickness: 11/64"
Material: Steel
Finish: Yellow Zinc
Hardness: Grade 8
Type: Lock Washer

Box of 5.

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