What types of door locks are there?
Dead bolts are generally fitted to external doors and come in three types: single, double, and lockable thumbturn. Single deadbolts use a key cylinder on the outside and a thumbturn on the inside to open or close the lock. A double cylinder deadbolt uses a key cylinder on the inside and the outside of the door. A thumbturn is a hybrid between a single and a double deadbolt. Deadbolts provides maximum flexibility and security in most situations.
Euro cylinder locks, most commonly known as Yale locks, come in several varieties: single cylinder, double cylinder and single cylinder with thumbturn. They are generally used in as external door locks in combination with deadbolts but can be used as an internal door lock.
Keyless locks generally use fingerprint or key code technology. This makes them more secure, as the keys to the lock cannot be stolen, or misplaced. Biometric locks can be keyed to only one person, further increasing security. Normally used by businesses, keyless locks can also be a viable solution for those with disabilities that make the use of keys impractical.
Fob locks are most often used to provide quick access without compromising security. A magnetic fob is programmed to activate a specific lock, allowing the user to open a door without the need for keys. Although usually used by businesses they can also be found on work sites and fitted to garages and locks-ups.