Attribute Value: 20B-2 Chain; 25 Teeth; 2 Rows of Teeth; Hardened Teeth; 270.383MM Outside Dia; 253.32MM Pitch Dia; B-Hub One Side; Rough Bore Mount; 31.75MM Chain Pitch; ISO Roller Chain Type; No Keyway; Steel Material; 96MM Max Bore . Names (Page 1)