![Internal / External Combo Tooth Lock Washers](https://s3-us-west-2.amazonaws.com/fastenersuperstore.com.files/images/categories/washers-internal-external-combo-tooth-lock.png)
Internal / External Combo Tooth Lockwashers
Internal / External Tooth Combo Lockwashers are available in steel with a zinc or black oxide finish and in stainless steel. Featuring twisted prongs on both the inner & outer edges, the teeth lock into the bearing surface to dig into and lock with the adjacent material.