LOCK TRIM This is the portion of the set usually attached to the surface of the door and consists of these parts:

ESCUTCHEON
Back plate that attaches to the door.

HANDLE
The portion of the set you grab to pull or rotate. The handle options are grips, levers, knobs or ring pulls.

SWING COVER
The flap that covers the cylinder or the emergency release access.

THUMB PIECE
This piece retracts the latch bolt on a thumb latch entry lock set.

TURN PIECE
This piece operates the dead bolt on the interior side of a locking set.

LOCK MECHANISMS are the portion of the set operated by the handles, cylinders, thumb latches and turn pieces:

DEAD BOLT A locking mechanism that is separate from the latching mechanism in a door set. A dead bolt can be locked by a key or turn piece. Manufacturer can provide separate dead bolt trim that is used above a handle set or can incorporate the dead bolt and handle trim onto the same escutcheon.

MORTISE BOLT A locking mechanism that is separate from the latching mechanism and is operated by a turn piece. It is usually used for interior applications to provide privacy on bedroom and bathroom doors.

MORTISE LOCK This mechanism integrates the locking and latching mechanisms into a single cartridge style lock. The mortise lock is available in a variety of functions such as entry, patio, privacy, passage and so on.