OLFA A-5 One-Way Autolocking Snap-Blade KnifeThe one way locking system on this knife means the blade is firmly locked in place for pulling in one direction only. The knife comes standard with an ultra sharp blade. OLFAs market leading blades as well as the knife design results in unparalleled sharpness for longer, meaning easier and safer cutting with less grip or drag. Its easy to see why OLFA knives are compared to samurai swords of ancient Japan. Replacement blades available Replacement