This 12B British Standard roller chain is also known as 12B Metric Roller Chain, has a 0.750" pitch, and fully meets all British Standard ISO Standards. What separates this 12B-1 chain from others on the market is the superior strength and performance offered by this chain versus others at the same or higher priced on the market. First, the chain components are manufactured to precision tolerances, then they are heat-treated and assembled. After assembly the chain is then pre-stretched for a reduction in elongation over time, then the chain is lubricated, packed, and ready for use. Besides the chain, we can also supply accompanying roller chain accessories and metric sprockets. For more information please contact us and we will be happy to assist you.