Especially with classic pocket knives, the nail nick is a popular opening mechanism. It owes its name to the typical notch in the upper part of the front of the blade, into which the fingernail hooks to open the knife. During the manufacturing process, the notch, which is usually 1 - 1.5 cm long, is literally driven into the material. In classic American pocket knives, the nail nick occasionally extends as a long groove parallel to the back of the blade, which is also called "long pull" in the technical terminology. Due to its discreet appearance, this opening mechanism retains the elegant appearance of the knife without disturbing the appearance. Due to the necessity of opening the knife with both hands, knives with nail hammer are considered two-handed knives. If the folded blade offers the fingertips of thumb and index finger enough space for the so-called pincer grip, modern knives often do without the nail nick.