Consider this when installing bars on your windows.
Drunk one night at my buddy's house in La Mulata, we were discussing security.
My Buddy pointed out that he could slide between the bars and enter the house.
He is thin (Tennis coach) and has to wear a t-shirt to slide through - otherwise he would chafe his nipples - but he is no thinner than a lot of banditos.
The spacing of the bars was 2.5 match boxes (regular Relampago size) - we had no measuring device at the time.
Many window bars are spaced wider than this.
Also, these were thick solid steel bars. The owner was telling me that they could not be cut with bolt cutters or a hacksaw. They were "schedule something or other - like they use in jail in the US".
Remembering an old episode of MythBusters I bet him that I could bend then enough to get through. I am not skinny, by the way. In fact I look like I have eaten several tennis coaches. He took on the bet and lost.
I took my t-shirt and a shovel handle that was lying around the patio, tied my t-shirt in a loop around the bars, inserted the shovel handle and started to twist. With little effort I bent the bars enough to get through.
So the morals of the story - do not space your bars any wider than a credit card distance apart and make sure you insert horizontal filler bars at 12" intervals.
But if you really want to get robbed, pay 1000 bucks for someone to knock you up a steel door!
Yikes!
Go see the dude next door to Caribe Tours in Charamicos. He has done loads of metalwork for me. Fast, accurate and reliable. Can't remember his name as it was many years ago but he is still there - I just saw him at Christmas.