As standard, exterior doors from Wiktorczyk are equipped with a strip lock from G-U, model MR 2/PZ2. The lock provides 3-point locking bolts. Two of the bolts come with a steel insert, which protects against sawing attempts.
The bolts are not only an anti-burglary element, but also an important structural component. When a key is turned in the lower lock insert, they slide out and are inserted into the strike plate strip in the door frame. The fact that the door leaf is tightened against the frame reduces warping of leaves.