I have not been successful in locating a windows supplier who uses a sturdy locking mechanism for casement windows. In high rise buildings and flats, this is usually not a common requirement. I wish to have a bolting mechanism to lock my new windows because it opens up to a high traffic, common area and I want to reduce the risk of a break in. I do not trust the locks used in PVC windows.

I have seen the locks used for bay windows in London, whereby a turn of the handle, the window is bolted at the top, bottom and sides of the window frame.

Does anyone know what I am talking about?

I have not been successful in locating a windows supplier who uses a sturdy locking mechanism for casement windows. In high rise buildings and flats, this is usually not a common requirement. I wish to have a bolting mechanism to lock my new windows because it opens up to a high traffic, common area and I want to reduce the risk of a break in. I do not trust the locks used in PVC windows.

I have seen the locks used for bay windows in London, whereby a turn of the handle, the window is bolted at the top, bottom and sides of the window frame.

Does anyone know what I am talking about?

Is that with rods running up and down the centre part? Usually used for French doors? Fersina?