Thumbturn

Small turnable knob at the center of the door knob that can be turned to lock

Trim Lock

Lock appears on the trim around the door knob, typically a small button that can be pushed to lock

Push-Button

Button in center of door knob that can be pushed to lock

28 degree Latch

Requires less rotation to release latch

Keyed Different

Keys provided are not customizable

Keyed Alike

Can be customized to match your existing key

2 (Better)

Moderate rating for security and durability

3 (Good)

Basic rating for security and durability