The TDI LDK Last Ditch Knife was designed by John Benner, veteran police Lieutenant and President and Chief Instructor of Tactical Defense Institute. With a profile that is not much larger than a credit card, this knife can easily be concealed wherever necessary. It can be worn around the neck, pinned under a tactical vest strap or lashed down with your boot laces. This backup knife is intended to be readily available as your "Last Ditch" attempt at defense when all other weapons have been removed. The LDK is constructed from stainless steel that won’t rust from coming into constant contact with natural body oils and is sold with a hard plastic friction sheath and black cord.