XS Scuba Stryker KnifeStryker Knives The Stryker knives strike the perfect balance between corrosion resistance and the ability to hold an edge. The 420 stainless steel blade is harder, and therefore holds an edge better, than a less expensive 304 stainless model. This results in a sharper knife, one that you can rely on in an entanglement situation. The 4. 75 (121 mm) blade is available in either a clip point or blunt tip design The two inch serrated edge along back of