The spacing between bars (typically 4–5 inches) allows guards to maintain a clear line of sight into cells while preventing inmates from escaping.
Round bars are often set into top and bottom horizontal "runners" or "flat bars" that are anchored directly into concrete or steel frames. rone bar prison
I believe you meant "Rone Bar Prison" or more likely "Rune Bar Prison" doesn't seem to match, however I found "Rone Bar" seems to be related to a prison, I assume you are referring to "Rone Bar" in Indonesia. The spacing between bars (typically 4–5 inches) allows