Crown Bolt Lock Washers: Crown Bolt Fasteners #8 Stainless Steel Internal Tooth Lock Washers (3-Pieces) Metallics 44918
These internal tooth lock washers are circular washers with teeth that extend inward for a secure hold. A preferred type of washer when the washer teeth must remain hidden for a finished appearance. Use with nuts and bolts of the same material for proper function. Comes in various materials and finishes. Color: Metallics.