Roller chain or bush roller chain is the kind of chain drive mostly used for transmission of mechanical power on 
many kinds of domestic, industrial and agricultural Auto Chain machinery, including conveyors, wire- and tube-drawing machines, printing presses, vehicles, motorcycles, and bicycles. It consists of a series of brief cylindrical rollers held collectively by side links. It is driven by a toothed wheel known as a sprocket. It is a simple, reliable, and efficient[1] method of power transmission.
Though Hans Renold is credited with inventing the roller chain in 1880, sketches by Leonardo da Vinci in the 16th century show a chain with a roller bearing.