In extreme close-quarter encounters where a suspect is attempting to take an officer's handgun, or an officer cannot access his handgun, the TDI knife is available as a last option knife. When worn on the pant belt the entire unit knife and sheath is well concealed. Designed by John Benner, founder and owner of Tactical Defense Institute. Now available with partially serrated blade, coyote brown handle and sheath, and black metal belt clip. In extreme close-quarter encounters where a suspect is attempting to take an officer's han . When worn on the pant belt the entire unit knife and sheath is well concealed . Designed by John Benner, founder and owner of Tactical Defense Institute . Now available with partially serrated blade, coyote brown handle and sheath, and black met .