3/8" x 11/16" Polished 18-8 Stainless Steel Lock Washers (10 pcs.)

Diameter: 3/8"
Diameter 2: 11/16"
Thickness: 3/32"
Material: Stainless Steel
Finish: Polished
Hardness: 18-8
Style: Medium Split
Type: Lock Washer

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.