Roller chain or bush roller chain is 
the kind of chain drive mostly used for tranny of mechanical power on many types of domestic, commercial and agricultural machinery, including conveyors, wire- and tube-drawing devices, printing presses, vehicles, motorcycles, and bicycles. It consists of a series of brief cylindrical rollers held with each other by part links. It is driven by a toothed wheel called a sprocket. It Drive Chain really is a straightforward, reliable, and efficient[1] means 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.