The Cast Iron Chain series are produced by Chinabase, and would have an average pitch of 1.631 in in some models, along with a maximum allowable load of 1110 lbs. Some of the models in the series have a maximum allowable load of 1630 lbs along with 74 chains per 10 feet. The average weight the series can work with will be from 1.5 kg/ft to 6.57 kg/ft.