|Internal-External Tooth Lock Washers are ideal for electrical bonding. Hey are useful where a large bearing surface is desired or to span oversized or elongated holes. Also they can be used as an insert between two adjustable pieces to maintain their position after the original setting.
A combined tooth lock washer, or external-internal tooth lock washer, combines the design of both into a single fastener. Often used in electrical applications, this combo washer also works with over-sized holes.