Mikes Spikes Male Chastity Ring
If you want to keep it under lock and key, this is your answer. The surgical steel collar and multi spiked inside make an EROTIC pleasurable experience. Not only can you lock it up but you can tighten down all of the allen keys one at a time to put him in a whole new place. And when and if you ever do let him out, LOOK OUT!
The Inside diameter is 44mm before the spikes and if the spike are all tightened it goes down to almost an inch. The weight is 25mm heigh and 38mm high and its is hinged and closed with a lock. The spikes can be adjusted to fit your pleasure level.
Medium 25mm height
Large 38mm Height