Attaches to Corner Applicator Finishing Boxes or Compound Tubes distributes compound evenly in corners after the Roller Corner process, feathering both sides in one pass. Built TradeTuff® handmade with USA billet aluminium and steel components. Features precision set carbide blades and durable stainless steel wings. Spring-loaded action finished corners slightly over or under 90 degrees, 5-year warranty. Also used to wipe down excess compound after the tape is rolled into a corner.