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With most knives, you have to open up the knife each time you need a new blade, so inconvenient.  Not so with the Nack.  Its easy and convenient and above all safe to change blades.

How it works, the factory loaded cartridge of blades is inserted into the knife.  A blade is selected by turning the end cap and a sliding button moves the blade outwards ready to use. Then simply lock the blade by sliding the red button back.