Use a stud finder to locate the metal studs throughout the room. Mark each stud by drawing a penciled X onto the walls. Determine how high you should hang the cabinet on the wall. Use a pencil to draw a line where the top edge of the cabinet will be aligned.
Apply a drop of liquid nail adhesive to the corners and center of the back of the cabinet. Lift the first cabinet box to the first stud. Align the top of the box to the proper height. Press the cabinet box against the drywall to help set the adhesive.
Choose the drill bit closest to the width of your self-tapping screws. Attach the bit, and drill a pilot hole through the back of the cabinet and the drywall. Ensure that the pilot holes line up with the metal stud. Drill two holes into the top of the box and one into the bottom of the box.
Switch the drill bit for a screwdriver bit. Holding the cabinet box steady, align a self-tapping drywall screw with the pilot hole. Screw the screw into the metal stud. Stop screwing as soon as you feel it catch, as over-rotating the screw can cause the metal to strip. Repeat with the remaining pilot holes.
Choose the drill bit closest to the width of the toggle bolt. At the top of the bolt, screw a pilot hole through the back of the cabinet box and the drywall. Align the hole with the metal stud. Repeat at the bottom of the cabinet box.
Apply a washer to the toggle bolt to help prevent the bolt from sliding through the hole. Switch the drill bit for the screwdriver head. Screw the toggle bolt into the metal stud at the top of the cabinet box. Repeat on the bottom of the box.
Repeat Step 1 through 6 to hang each of the remaining cabinet boxes.