Here you go.
CAUTION:
Link takes you to a Non-Nude Bondage Image to show stock.

Hope nobody gets their shorts up in a bundle posting this link but I figured it would be safer than posting an image

http://upload.wikimedia.org/wikipedia/commons/0/0a/Wooden_stocks_(photomodel_Monique).jpg

Now the unit I am looking for is smaller than this and more portable more like the Yoke Stock (for neck and wrists) but for the wrists and ankles.