Ankle/wrist stocks have been used as restraining devices for many hundreds of years, with examples finding their way into museums and displays. Stocks have a simple concept - to restrain an individual's ankles, wrists and/or head between the material used to form the stock assembly. There are three basic categories of stocks: little stocks, box stocks, and frame stocks. Little stocks are more mobile than the other two categories, while frame stocks are the largest of the three classifications. Frame stocks can have their own dedicated frame (the stock is a piece of freestanding furniture), or be mounted in a doorway, at the head/foot of a bed, on a horse, etc. When used in BDSM, stocks can have many purposes, from limiting mobility and personal freedom, to holding an individual secure as a form of discipline, for sexual stimulation, medieval role playing or sexual role-play and any variation in between.