Double lock: One blade, twice the safety. During standard use, the Liner-Lock automatically engages and locks the blade open. But when you need to make more rugged cuts, push the Double Lock switch forward to block the Liner-Lock from possibly disengaging and allowing the blade to close on your hand E-Z Replace blade: Switch out dull blades quickly and easily. A small lever on the side of the blade housing disengages the lock on the razor blade and allows for quick blade replacement Nylon handle: The knife's fiberglass filled nylon handle has a specially designed shaping to fit nicely in your hand with texture for grip and natural pulling motion with the knife Everyday carry: The DX126 Pro Razor Knife was designed with safety and versatility in mind, comes equipped with a double-ended razor blade, pocket clip, and lanyard hole