3/8" x 11/16" Chrome Plated Grade 8 Steel Split Lock Washers (16 pcs.)

Diameter: 3/8"
Diameter 2: 11/16"
Thickness: 3/32"
Material: Steel
Finish: Chrome
Hardness: Grade 8
Style: Medium Split
Type: Lock Washer
Application: Nuts and Bolts

Box of 16.

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