Spring Assisted Coast Guard Krambit Rescue Tactical Folder Pocket Knife by Marks. $9.98. The unique design folding knife in stainless steel. The handle's shape settles the index finger on the underside, suitable for use. Blade style is a drop point in 440 stainless steel, making it harder, higher on the Rockwell scale and in turn extending the amount of time for it to stay sharp. Right thumb study give fast opening, and the linerlock release allows easy one-hand closing.