Well this consists of a wooden/metal/spiked frame that is in the shape of a human body doing a star jump that had lots of straps on it. The victim is strapped to the frame and if the frame is spiked, it will pierce the body. Otherwise, it is the perfect holding in place tool that a torture chamber can ever have.
A variation might include a drugged and spiked ball that is stuffed in the gentials.
for this one you need these ankle shackles that are connected to chains and the chains are connected to a crank. The victim's ankles are placed in the ankle shackles and the torturer turns the crank, pulling the victim into split position. If this is used for interrogation, the crank can be turned as slowly or as quickly as the torturer wants.
The splits will be very painful, especially if the torturer turns and rests (to let the pain set in).