This LEVEL5 4in Corner Finisher (also called an "angle head") is used in conjunction with a corner applicator box to apply a finishing coat to angled corners.

The larger coverage provides by this corner finisher creates a finer feathered corner versus 3” or 3.5” versions. Drywall finishers often pair a 4” corner finisher with a 3” or 3.5” for a tape coat / finish coat combination.