Épingles de sûreté en acier et en bois pour fenêtre 2 1/2 po Prime-Line (Ensemble de 8)

The pins seem very solid, and I like they provide several keys. Once you drill the hole and place the pin more or less flush, someone from the outside will not be able to open the window (previously they used a crowbar to pull the screws out of the latch, now they would have to break the window to get it open). From outside you can’t tell the pin is inserted, so a burglar will be clueless what is stopping them from opening the window. Then even if somehow they knew about the pin, it is very difficult to get the pin out without the key (so keep it handy for yourself when you want to open the window). I think 1 per window is enough, but you can put two if you want to be double secure.

Simple and streamline