Chain

A broad metal chain made of torus-shaped links. A metal chain with diamond fashioned link pins. Roller chains, a chain is a sequence of connected links, usually made of metal.
Chains are typically made in one of two styles, according to their intended use: Those designed for lifting, such as when used with a hoist, or for securing, such as with a bicycle lock, have links that are torus shaped, which makes the chain flexible in two dimensions. Those designed for transferring power in machines have links designed to mesh with the teeth of the gears of the machine, and are flexible in only one dimension. They are known as Roller chains. Chains can also be ornamental as jeweler.

Uses for chain
Exact uses for chain include: Bicycle chain, chain that transfers power from the wheel to the
drive-wheel of a bicycle thus propelling it Chain drive, the main feature which differentiated the safety bicycle Chain gun, type of machine gun that utilizes a chain, driven by an external power source, to actuate the mechanism rather than using recoil Chain pumps, type of water pump where an endless chain has positioned on it circular discs Chain-linked Lewis, lifting device made from two curved steel legs Chainsaw, portable mechanical, motorized saw Curb chain, used on curb bits when riding a horse Keychain, a small chain that connects a small item to a key ring Lead shank, used on difficult horses that are misbehaving O-ring chain,


a specialized type of roller chain Roller chain, the type of chain most commonly used for transmission of mechanical power on bicycles, motorcycles, and in industrial and agricultural .machinery Snow chains, used to improve traction in snow Timing chain, used to regulate the valve and ignition timing on an internal combustion engine 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 Bicycle lock, lockable chain.