There are several different types of steel coil slitting knives, including circular slitting knives, straight slitting knives, and crush-cut slitting knives. These knives are used for precision cutting and slitting of steel coils into narrower strips or sheets. Circular slitting knives feature a circular shape with sharp edges, while straight slitting knives have a straight cutting edge. Crush-cut slitting knives have a unique design that allows them to crush and cut the material simultaneously. Each type of knife is used for specific applications and offers different advantages depending on the desired outcome.