Pitch 3/4″ 19.05mm Chain Sprockets 12T to 40T for #60 (12A) Duplex Roller Chains
12T，13T，14T，15T，16T，17T，18T，19T，20T，22T，24T，25T，28T，30T，32T ，34T，35T ，36T，38T，40T. It is made of high-quality C45 steel. The size data does not need to be precise, and may vary depending on the value between production batches.