When a client asks for "a security lock", they almost always mean a multipoint, but not all multipoints offer the same level of resistance, and the number of locking points is the variable that determines it most.
What an additional locking point does
Each additional locking point (besides the lock's main point) is a bolt or hook that engages when the key is turned, anchors the leaf to the frame at a different point and spreads the effort that a leverage attempt would have to overcome. The more points, the harder it is to force the door with prying tools.
How many points to recommend by case
A 3-point lock offers a noticeable improvement over a simple one-point lock, suitable for interior doors needing basic security. For home entrance doors, 5 points is the recommended standard for medium-to-high security. On security or high-security doors, it is common to find 7 points or more, combined with anti-lever bolts on the hinges.
Why the frame matters too
A many-point multipoint lock loses much of its effectiveness if the door frame isn't well anchored to the wall or is made of a weak material. Quoting the lock without checking the state of the frame can give the client a false sense of security.
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