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The bit of a key is the part that actually engages the locking mechanism of a lock .. key. key ( lock ). lock. Lock ( security device ). -LRB- For example the tumblers in a pin tumbler lock . -RRB-. lock. Lock ( security device ). pin tumbler lock. pin tumbler lock. The exact geometry of modern keys is usually described by a code system .. This is referred to as the bitting .. The bitting instructs a locksmith how to cut a certain key , to replace a lost key or make an additional copy .. key. key ( lock ). locksmith. Locksmithing. The bitting is usually a series of integers -LRB- e.g. 372164 -RRB- that is usually translated from a key code chart or from a bitting code list to settings on specially designed key machines .. key. key ( lock ). key code. key code. In many code systems each digit in the bitting corresponds to a certain location on the key blank where a cut or notch is to be made and also indicates the necessary depth of the cut .. key. key ( lock ). Many lock companies use their own proprietary code system .. lock. Lock ( security device ). Depending on the maker , the bitting sequence can be from bow-to-tip -LRB- the bow being the larger , handle portion of the key -RRB- , or can be from tip-to-bow .. key. key ( lock ). A smaller number is typically a shallower cut on the key , but not always .. key. key ( lock ). Assa bitting codes are reversed , where the higher the digit , the shallower the cut .. One American manufacturer , Eagle Lock Company , used letters exclusively for bitting codes .