They will be the first British pair to compete in the sport at an Olympic Games.
Eisele finished third, about twenty-five yards behind the British pair.
The British pair won the match, leaving the Zimbabweans with a silver medal.
"A British pair of identical twins reared apart".
This change suited the British pair and they pulled level at 8-8 and then pulled ahead at 11-8.
The British pair have won silver in 2009, 2010 and 2011.
James Cracknell: British pair may move into coxless four to deliver gold.
The British pair lie in 11th position following the short programme on Sunday.
The British pair left Cape Breton, abandoning the company and the town.
The Brazilian pair won the group decider with a straight sets win over the British pair.