5" overall. 2 1/2" H-1 stainless curved design clip blade with finger hole. Black FRN handles. Lanyard hole. Black injection molded polymer sheath with neck chain. A purpose-designed personal-defense knife conceived by U.S. Army combat veteran John Shirley and his friend Sam Owens. While deployed to Afghanistan, Shirley learned that an alarming number of U.S. personnel were falling victim to sexual assault, particularly while showering. Drawing from his knowledge of the Japanese martial arts and with the help of OwensÍ skills as a craftsman, they developed the ARK as a lightweight self-defense tool that can literally be carried anywhere.