CobraTec Knives SADCCTK1SDAGNS: The CobraTec CTK-1 is designed for use with any task. Featuring zinc-aluminum alloy handles, it is a knife that you can rely on to get the job done. Featuring an OTF opening design it allows for rapid deployment with minimal effort. The 4.25\" closed length is ideal for everyday carry and the glass breaker provides a survival necessity.