Roller chain or bush roller chain is the kind of chain drive mostly used for transmitting of mechanical power on many types of domestic, commercial and 
agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, vehicles, motorcycles, and bicycles. It contains a series of short cylindrical rollers held together by aspect links. It is driven by a toothed wheel called a sprocket. It really is a simple, reliable, and efficient[1] Stainless Steel Chain 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.
