CRKT - PSD Serrated - Black G-10/Carbon Fiber - 4116 - 3.63"Particle. Separation. Device. Break it down to brass tacks: the P. S. D. is made to slice. This everyday carry folding knifes blade is designed with a full recurve and a highly efficient double grind. And, with Assisted Opening, it shows up to work in the blink of an eye. When designer Jim Hammond of Birmingham, Alabama put pen to paper, he did so with the intention of creating a knife that was equal parts powerful, compact, and highly aesthetic. The