Attribute Value: 200-2 Chain; 12 Teeth; 2 Rows of Teeth; Hardened Teeth; 10.83" Outside Dia; 9.66" Pitch Dia; B-Hub One Side; Rough Bore Mount; 2-1/2" Chain Pitch; ANSI Roller Chain Type; No Keyway; Steel Material; 4-1/2" Max Bore . Names (Page 1)