||Keyless Electronic Deadbolts do not require a key to enter, but you can use one if you wish. Keyless deadbolt locks are programmable so you can create your own custom code for locking and unlocking the door. This is a great soluction for a secure home and not worrying about losing keys.
||Single Sided Deadbolts have only a thumb turn on the inside of the door. The bore hole for the deadbolt is drilled only partially through the door so from the outside you don't see the deadbolt. If your door already has a bore hole completely through the door, this type of deadbolt will not work for you.