Shop Cold Steel Commercial Series Polymer Black. This Commercial Series Boning Knife has a stiff trailing point blade in a satin finish and a black Kray-Ex handle. Cold Steel’s Commercial Series was created to provide affordable kitchen cutlery for professional butchers, fishermen, hunters, and chefs. Summary of Cold Steel Commercial Series Stiff Boning Trailing Point Polymer Knife Black(Satin) CS 20VBCZ. Commercial Kitchen Series. 11.25″ (28.58cm) overall. 6″ (15.24cm) mirror finish 4116 stainless blade. Black handle has Zy-Ex core with food-safe Kray-Ex exterior. Boxed.