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A cylindrical lock is designed to be installed through the door with a knob or lever on either side that retract the latch when turned or depressed.
The main advantage of a cylindrical lock is its relatively quick installation. Two holes are drilled in the door, one through the face of the door for the lock chassis and the other through the strike edge of the door for the latch bolt.
Cylindrical locksets require less time for installation since a mortise pocket doesn’t need to be drilled and chiselled out. Cylindrical locksets are commonly found in homes, offices and interior doors.