The task of hanging drywall is made simpler by a variety of tools. A drywall flat box is one of the less popular choices.
What exactly is a drywall flat box, then?

Simple drywall equipment called flat boxes make it easier for installers to swiftly and uniformly apply mud to the wall. The boxes have a long handle with a brake, are filled with joint compound, may be adjusted for thickness, and come with the boxes.

In order to apply drywall mud, a drywaller passes a flat box over the gap they are covering.
Further information is provided below.
HOW ARE DRYWALL FLAT BOXES USED? FM

Drywall joint compound is kept in a box on wheels called a “flat box.” To let mud flow through the slots, you must release a brake lever on the handle.

As the drywall mud is applied to the wall, a plate applies pressure to it to smooth it out.
Using a drywall flat box is as follows:

Put mud in your container. Place the blade and box wheels flat at one side of the joint for horizontal joints. Roll the flat box from one end of the joint to the other after releasing the brake lever, applying uniform, steady pressure. Start at the bottom and run the flat box halfway up the wall for vertical joints. After that, raise the box to the joint’s top and lower it while continuing where you left off in the center. Even though drywall flat boxes can hasten drywall finishing, you must experiment with the setup to achieve the ideal flow. In order to get even coverage, it could also take some practice.

Additionally, automatic taping devices that pair flat boxes with automatic tapers are available. These, however, are typically more expensive.
DO DRYWALL FLAT BOXES MAKE SENSE? It depends on your needs as to whether purchasing a drywall flat box is worthwhile.

Probably not if you’re performing a repair job or a small room. However, a flat box can save you a lot of work if you’re working on a big project or need to reach high places.

The fact that drywall flat boxes have handles, some of which are extendable, makes them perfect for towering walls and ceilings. Additionally, they have a learning curve even though they might aid in achieving smooth and equal coverage.

Consequently, purchasing one is probably not worthwhile unless you’re working on a large project.

LAST THOUGHTS Simple finishing tools called dry wall flat boxes enable drywallers to apply mud more quickly. They’re excellent for experts and do-it-yourselfers working on big projects.

Even though they are fantastic, automatic drywall tools have a learning curve and are not required for modest drywall applications.