<Li> O - ring chain, a specialized type of roller chain </Li> <Li> Roller chain, the type of chain most commonly used for transmission of mechanical power on bicycles, motorcycles, and in industrial and agricultural machinery </Li> <Li> Timing chain, used to transfer rotational position from the crankshaft to the valve and ignition system on an internal combustion engine, typically with a 2: 1 speed reduction . </Li> <Ul> <Li> Ball and chain, phrase that can refer to either the actual restraint device that was used to slow down prisoners, or a derogatory description of a person's significant other </Li> <Li> Belly chain (or "waist chain"), a physical restraint worn by prisoners, consisting of a chain around the prisoner's waist, to which the prisoner's hands are chained or cuffed Prisoner in belly chain </Li> <Li> Bicycle lock (or "Bicycle Chain"), lockable chain </Li> <Li> Chain boom, large chains used to exclude warships from harbors and rivers </Li> <Li> Chain link fencing, fencing that utilizes vertical wires that are bent in a zig zag fashion and linked to each other </Li> <Li> Chain mail, a type of armor consisting of small metal rings linked together in a pattern to form a mesh . </Li> <Li> Door chain, a type of security chain on a door that makes it possible to open a door from the inside while still making it difficult for someone outside to force their way inside </Li> <Li> Gang transport chain, a chain used to shackle two or more inmates together for transport or work outside the facility, forming a chain gang </Li> <Li> Leg iron chains (fetters), an alternative to handcuffs </Li> <Li> Prisoner transport restraints, a combination which consists of a pair of handcuffs attached by a longer chain to a pair of leg irons </Li> <Li> Security chain, chain with square edges to prevent cutting with bolt - cutters </Li> </Ul>

In which of the following industries are neck chains most commonly used