Gerber Guardian I,real nice piece!it was given to me as a gift.fits nice in my boot inside the nylon sheath.9 1/4 in. overall.blade is 4 5/8 long
Nice, and not that expensive.
I just ordered the S&W HRT9 Military Boot Knife. It'll be delivered Wedensday and in my boot Wedensday evening.
That's one of the best dedicated concealment fixed blades I've ever used (ie deployed).
I have several of the older (aluminum handles, stainless blades, leather or Cordura sheaths) and although I've never actually worn them in a boot, they have worked very well.
If memory serves the older Guardian was also used by the gents who went over to Iran a long while back (private hostage rescue spearheaded by an SF lifer; Ken Follett's Wings of Eagles was the book name I think).