The hook blade for cutting seat belts and the half-serrated 3¼-inch blade are both made from 440C stainless steel and have a flat black finish. The knife blade is quite sharp, as is the belt cutter, and both have a thumb stud for one-handed opening from the right side. The knife and seat belt hook lock open thanks to a liner lock mechanism (like most CRKT knives). The seat belt cutter works well. I tested it on the seat belt in an old junk truck. With the belt under tension, a couple tugs with the non-threatening looking hook will slice the belt, especially if you cut on an angle. The five-lumen LED provides just enough light to see about 10 feet in total darkness, and it's just right for checking pupil dilation, which is a critical assessment in many types of injuries. The light has a convenient access panel for easy battery replacement.