Columbia River Knife and Tool 2390 Renner Necholas
Columbia River Knife and Tool's Renner Neckolas Neck Knife is a full-tang premium 8Cr13MoV stainless steel blade, sandwiched between Micarta scales and held securely by stainless steel pins and the finger-ring insert. As a result of this skeletonized high-tech construction, the knife weighs only 1.2 ounces.  The Neckolas sheath is really the secret to the system.  The key to easy re-insertion is the thumb notch on the sheath top edge. Just insert the blade into the sheath and 'pinch.' The knife clicks into place.