Generally used for exterior applications. It is operated with a key from the exterior of the home and a push button or turn knob from the interior.
Generally used on bathroom or bedroom door. It provides a push button or turn knob on the inside and comes with an emergency release on the outside that allows the door to be unlocked by inserting an emergency release tool.
Generally used on closets or other rooms that do not require locking.
Generally used on storage room that the outside knob is fixed and entrance by key only. The knob will lock itself everytime the door is closed and cannot be left unlocked. The inside knob always remain unlocked providing emergency exit.
Does not operate and is often used as a door pull or for aesthetic purposes only.
To determine the handing, view the door from the exterior side and locate the hinges. If the hinges are on the left, you will need a left-handed lever. If the hinges are on the right, you will need a right-handed lever.