Not for the faint-hearted...
... but if you're into that special kind of pain, then this shiny stainless steel penis ring has a lot to offer.
It features four screws with sharp ends that are simply unscrewed to put the cock ring on.
Once it's on, tighten the screws until you reach the desired "pain level" and simply enjoy the pleasure.
The inner diameter of the ring is 24mm, and the height is 26mm. It weighs approx. 113 gr.