Cable pullovers allow for a great stretch and full contraction of the lats. The added benefit of having your entire back supported by lying on the ground lets you focus on volume without the fatigue accrued by supporting yourself.
Remember, big lifts first, then do this low-stress finisher for added volume.
This accessory exercise for the deadlift will strengthen your spinal erectors. This helps you to deadlift heavier while keeping your spine stable and safe.