TheBenchmade 430SBK Redoubt is the latest folding knife from the Black Class series, which will be perfect as an edc or tactical knife. The knife has a typically working purpose, so the blade is made of hard D2 tool steel, which has high retention and impressive wear resistance. The version with a partially serrated blade. The Benchmade 430SBK Redoubt is a folding knife, bridging the gap between an edc knife and a typical tactical knife. The knife has a minimalist design, a size perfectly suited for everyday carry and excellent cutting qualities. Benchmade 430SBK Redoubt - edc knife in SD2 steel. The blade is made of excellent CPM- D2 steel hardened to 60-62 HRC. CPM-D2 is a powdered variant of air-hardened D2 steel, but with much better retention and modified carbide microstructure, which makes the blade eminently wear-resistant, impressively long in sharpness and relatively easy to sharpen. Such parameters make CPM- D2 a great alternative to much more expensive super steels, especially if you don't have a sizable budget. However, it is worth remembering to properly maintain the knife, so that the knife will serve reliably for many years. When choosing a knife made of such steel, it is worth getting a diamond sharpener, as sharpening with a standard ceramic whetstone can be very labor-intensive and inefficient.