In extreme closequarter encounters where a suspect is attempting to take an officers 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.