Roller chains act as chain drives for transmission of mechanical energy or power to industrial or household machines. These chains are used as integral parts of printing systems, conveyors, automobiles etc. PIV or positively infinitely variable version of this range of chains are instrumental in proper functioning of transmission gearboxes used in packaging unit and textile production arena. Available in pre-lubricated design, this array of roller chains can maintain stability of their operating speed even after their repeated operations. Hardened design of chain pins safeguards these against wear. Special design of their sidebars improves their structural strength. These metal chains are accessible in pre-stressed design for their prolonged service life.