Heavy Series Roller Chain 12AH-1,16AH-1,20AH-1,24AH-1,28AH-1,32AH-1,40AH-1,12AH-2,16AH-2,20AH-2,24AH-2,28AH-2,32AH-2,40AH-2,12AH-3,16AH-3,20AH-3,24AH-3,28AH-3,32AH-3,40AH-3