In extreme close-quarter encounters where a suspect is attempting to take an officer&';s handgun or an officer cannot access his or her 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. Fits maximum belt height of 1.75", width of 1.25" and thickness of 0.13".