The Krauser Retaining Tongue / Lock Adapter (Straight) for K1 cases (Set) is a special set of replacement parts that includes straight retaining tongues and lock adapters. These parts are specifically designed for Krauser K1 cases and are used to securely attach the cases to the carrier system. With this set, you can make your Krauser K1 cases functional again if the existing retaining tongues or lock adapters are damaged or worn out. One set of these replacement parts contains all the necessary components to secure both sides of a case.