With improved fatigue resistant, this Renold Synergy roller chain performs, on average 30 percent better than other brands under continual heavy loads and repeated shock loading. Renold Synergy chain has a six times better wear resistance than other quality competitors, and with each component being engineered to perfection, improves the performance of the chain. This Simplex chain has a 1 1/4 Inch pitch and is 50ft in length.