One of the most appaling torture devices to ever be implimented. This is an iron pincer with hemicylindrical blades that formed a long narrow tube when closed together.
The inside was lined with sharp spikes (which are often heated red-hot before use). This device was clamped to the victim's penis and once the penis has been "cooked" enough, the penis was ripped off.
When I found out what crocodile shears were I barfed.