When you consider hardware, there are two different and distinct types of locks: tubular style and mortise style. One is more secure, and the other is more popular. And while one is easier to install, the other requires special equipment. But which is which?
Tubular (standard): Standard locksets that will fit into 2 holes that are 2 1/8" in diameter. Select this for a new door that is pre-drilled.
Mortise (custom): A Custom installation of a 4" deep by 5" tall lock "box" into a pocket in the door. The edge will appear to be a solid 8" tall plate.