with most light slots leave themselves the covering grid plates also only one handle take off. In fewer than 10 seconds the burglar disappeared thus " from the surface "! Now it can out-lever the kellerfenster in peace, without someone sees it or hears someone somewhat, in the slot and begin its " work ". That he finds thereby usually a secondary key and leaves the house like a friendly visitor by the Eingangstuere, is only still irony of the fate...
The attachment of the lattices is covered and made by the assembly with special pegs so indisputable. Depending upon desired safety level - e.g. for the high request with banks - the lattice bars with additional steel bars can be protected in such a way that splitting becomes practically impossible also with friction disks. If the possibility of the emergency exit by the lattices to be preserved must, gives it also for it to established solutions.
