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Locking double glazed doors.
Some upvc doors however may use screws with a hexagonal indentation in the screw head.
A set of double doors consists of two door leaves installed in a single frame.
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The other leaf is considered inactive and remains locked the majority of the time.
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How to change a upvc door lock.
In this case an allen wrench also called a hex wrench is the proper tool.
Most strike plates are held in position with phillips cross head screws.
One leaf is considered active and can be opened and closed using a knob or lever.