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 major advantage of a cylindrical lock is its relatively quick installation. Two holes are drilled into 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 latchbolt.
Disadvantage is, it is the less secure then mortise style.
A Cylindrical door lock is the least expensive because of its quick assembly. Surprisingly, this lock was only invented in the last century. So, although it is the most basic of locks, it hasn’t been around for long.
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