“PD” stands for “personal defense,” and if you wanted to use it for that, the PD1 would do a fine job. It’s a light, slender knife that will do lots of other useful things, and is also terrifically strong. The PD’s 6-inch, D2 steel, drop-point blade is tempered by DiamondBlade’s unique Friction Forging process, which produces an extremely hard edge that stays sharp forever, and a much softer spine that is impossible to break. In 2006, I watched Charles Allen, whose brainchild Friction Forging is, lock a PD1 in a vise, slip a pipe over the handle for leverage, and bend the knife 90 degrees. (And Charles had to haul like hell to do it.) Then he bent it straight again. The knife had a small ripple near the base of the blade, but was unbroken and perfectly usable.