Chastity device discussions and reviews discussion

Query My wife and I took measurements of my ring size, positioned behind the scrotum… The numbers pointed to a circumference of about 22cm, which works out to over 6cm in diameter. However, most rings we’ve come across appear to be 5cm or smaller… Does this mean we aren’t going tight enough? Are back rings supposed to fit quite snugly? My flaccid length is roughly 10cm from the top of the penis to the tip… though standing outside naked in the cold seems to have shrunk it a bit… We are leaning toward the metal device often referred to as a Jailhouse… I spotted one in black on a popular online marketplace…but that model looks too small overall unless we’ve measured wrong… Any tips?