Layer

A layer, in the Swiss Army Knife world, refers to one slot in the knife. Generally speaking, each slot has one back spring, but may contain mutliple tools. For instance, most Victorinox knives have, in their first layer, a Main Blade, a Small blade, and then a corkscrew or philips screwdriver on the back. These are all "controlled" by the same spring and all fit between the same layers of aluminum separating these tools from the others. This set is called one "layer."

Collector and users many often refer to a knife's thickness by layers. For instance, a Spartan is a "Two Layer" knife. Where as a CyberTool Lite is a "Six Layer" knife.