Exterior lock-sets are a standard example of locks capable of securing exterior doors, and can be found in most residential buildings and houses. Typical exterior lock-sets consist of either two keyholes, both on the outside or inside, or a keyhole on the outside and a button that can be rotated or pressed to easily lock the door from the inside.
Exterior lock-sets are known to provide more security than privacy locks, given their solid interior scaffold and requirement of a key for exterior entry. The advantage of using such locks is that they are fairly priced, provide more security than a privacy lock, and work well when coupled with a deadbolt. However, many models of exterior lock-sets can nonetheless be picked with a simple piece of plastic such as a credit card, and are capable of being forcibly opened as well. In order to elucidate the exterior lock-set and deadbolt pairing described previously, we will depict the purpose of a deadbolt below.