A combat knife stored in the left shoulder pylon of an Evangelion which uses it, and is one of the Evas' basic armaments. The blade of the knife vibrates at an extremely high frequency, increasing its cutting sharpness to the point that it can cleave the matter of a target object at a molecular level. No other Evas besides Unit-00', Unit-01, and Unit-02 are ever seen using Progressive Knives (although in non-canon materials, such as video games or model kits, Unit-03 and Unit-04 are seen using the same Progressive Knife as Unit-01).