only one tool for the most common crimping applications, quick and easy changing of crimp dies without additional tool, safe and protected storage of the interchangeable dies in a round magazine, comfortable, powerful crimping pliers in professional quality, reliable crimping results as with permanently mounted crimp dies, consistently high crimp quality due to precision dies and positive ratchet (unlockable), chrome vanadium electrical steel in special grade, oil-hardened, round magazine: plastic, glass fiber reinforced