Spreader bar

A spreader bar is an article of bondage equipment usually consisting of a metal or wooden bar,[1] with attachment points for bondage cuffs at each end, which can be fastened to wrists, ankles or knees to hold them apart.

When applied to the wrists, a bar keeps the arms spread away from the body, providing an unimpeded access to the subject's torso.

When applied to the ankles or between the knees, it immobilizes the subject by preventing all but the most awkward walking, and keeping the legs spread to allow unimpeded access to the subject's groin and trunk.

[1] Homemade versions can be made from dowels, bamboo rods, or closet poles.

[4][5] Media related to Spreader bars at Wikimedia Commons