The flat box extension handle is used in conjunction with flat boxes to apply a consistent joint compound to taped, flat joints on walls and ceilings. Made of heavy gauge and light-weight aluminum, DEWALT drywall flat box extension handles is an essential tool for any drywall project. Designed with a quick slide adjustment locking lever that provides easy access to unlimited positions and various lengths, drastically improving efficiency on the job. DEWALT drywall flat box extension handles feature an incredible lightweight, stainless steel pivoting lever system that provides extreme durability and will last longer than other standard flat box handles.