The 5 RH Is five groves right handed twist (I assume)
The packet with the expended shell is in lots of firearms these days when they are sold new as many states require them.
Thankfully the state I live in (Nevada) does not so I just toss them out.
5 inches for 360° of twist, however many grooves there are. It's easy to count grooves, but it's a bit harder to measure the twist rate (though a marked cleaning rod will do that just fine.)