Brutal Torture: 16 Twisted Techniques & Historic Devices ...
Skull and limb crushers are thumbscrews kicked up several notches. Basically vices with spikes, they would be shaped to conform to the targeted limb. Rows of sharp points would be ratcheted to higher and higher pressure, until something had to give… and bone breaks before steel. (Images via jabulela, cope0021, and Stephanie)