1-1/8" x 1-7/8" Zinc Plated Grade 2 Steel Split Lock Washers LWS-324 (10 pcs.)

Diameter: 1-1/8"
Diameter 2: 1-7/8"
Thickness: 5/16"
Material: Steel
Finish: Zinc
Hardness: Grade 2
Style: Medium Split
Type: Lock Washer
Application: Nuts and Bolts

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.