The black blade of this snap-off blade knife is 40 per cent sharper than conventional snap-off blades. This allows you to cut materials such as cardboard, carton or foil with maximum precision - ideal for employees who need to make an exact first cut. The robust metal housing made of die-cast zinc sits comfortably in your hand when cutting. You can change the blades easily and without tools and replace them with extra-sharp black replacement blades or standard 18 mm snap-off blades.