The dimensions that a door must be bored or mortised in order for a handle set to be installed.

The backset is the distance from the edge of the door to the center of the 2-1/8" bore hole. In the U.S. there are two common backsets for residential locks, 2-3/8" and 2-3/4". We will
pack your locks with a 2-3/8" or 2-3/4" latch depending on which
backset you specify.

A round hole made using a drill, commonly used in reference to tubular door lock preparations.

The Concealed Fastener Mechanism provides a cleaner look, with no visible screws on the interior rosette of passage and privacy knobs/levers.

Passage - A handle set without an internal locking mechanism. A passage set is used on a door that doesn't require privacy, for example; between a living room and a kitchen or closet.

Privacy - A handle set with a locking mechanism (privacy pin or thumb turn)

Dummy - Dummy sets have no latch and require no bore hole. They are surface mounted to the door so you can install a dummy set wherever you choose. They can be secured to the rosette and to the door with a supplied Allen wrench.

Levers and some handle grips are either Right-handed or Left-handed depending on the orientation in which the door opens and the side the hinges are located.

A knob or lever that includes a keyed cylinder that locks from the face of the hardware set instead of requiring a separate deadbolt and bore hole in the door. Often used in place of an entry set for secure entrance to the home or for a back door entrance.

A lockset that fits in a mortised door, featuring a rectangular hole that a mortise lock body slides into.

Door locks that offer multiple latching points with one locking mechanism.

A deadbolt featuring a keyway on the exterior and thumb turn on the
interior.

A lockset requiring bored (round) holes rather than a chiseled rectangular mortise door preparation.

The metal plate installed on the door jamb that receives the latch bolt when the door is closed.