Bondage wheel
From wipipedia.org
A bondage wheel is one of the largest (and most expensive) pieces of SM equipment that might be found in a dungeon. It consists of a large vertically mounted, rotating wheel to which the victim is strapped. In this respect it is similar to a St Andrews cross, the victim can either be strapped facing the wheel (suitable for whipping) or facing out (for genital torture). The difference is the bondage wheel can be rotated, allowing the victim to be turned upside down.
The wheel body has various straps for restraint and normally also attachments for extra rope bondage. There may also be foot rests, hand holds and a head support.
