This 7″ LEVEL5 MEGA drywall flat box is used to apply a base coat of mud compound over taped drywall joints. MEGA boxes hold 25% more joint compound versus standard boxes which makes the 7” MEGA box particularly useful when applying mud-heavy base coats to taped seams. Many drywall finishers pair a 12” flat box with a 10” box to trowel mud compound and feather joint edges to perfection.