Deadbolts are your first line of defense when securing your home or business. When choosing a
deadbolt don't buy the cheapest one you can find at the typical hardware store because although it
may technically be a deadbolt it will only give a false sense of security. Look further for a higher grade
deadbolt like this one. The biggest difference is that it's a grade one lock so it will take a lot of abuse before it breaks under attack. The difference in price isn't really that great.
See backset diagram