This product meets the Police Hallmark safe living and SKG ®
You can not imagine, but a gap of 15cm for many burglars enough space to break. Not for nothing advises the police slightly above (another word hung windows) to protect well.
The practice shows that barrier rods very preventive effect. They are clearly visible from the outside.
A burglar tries not to insist once more inside.
Another practical convenience is that the window day and night can be left open to vent. A safe idea!