I think you'll be surprised at the effectiveness of this seemingly simple workout. Making small adjustments to your grip and stance can make huge impacts on which muscles get more work, and the exercises you have lined up today will definitely challenge new areas of your back.
As if the tough movements and 8-rep sets aren't enough to make you grow, today's back attack also includes a mid-workout dropset and a rack-run on your final exercise. When running the rack, remember to drop 5-10 pounds every time you hit failure with your dumbbells. Go all the way down the rack!