My home living complex has recently had a 5 foot brick wall put around it. It has become clear to me that this wall is very easy to climb over. I saw somewhere some small tiangle like pins that you can put along the entire top of the wall that would not allow anyone to get a full grip in order to climb over. Can someone give me more info on this and direct me to where I might be able to buy them. I would expect that they come in lengths allowing users to simply cut them. Any info would be appreciated.