Deadbolts are an essential part of any entry set. Featuring a steel bolt, or cylinder, that sinks deep into the doorjamb, deadbolts serve a dual purpose, adding to both the security and style of your home. When selecting a deadbolt, first decide what style will best match your entryway. There are traditional deadbolts, contemporary deadbolts and classic deadbolts you can choose from. Different doors require different backsets, from 2 3/4 inch backset to 3 inch backset. There are also adjustable deadbolts that can be adjusted to match the doors thickness.