Heavy Duty Fence Gate Kit Gate Hardware No Sag Kit 2x4s Adjustable for Wooden Fence Gate Windows Shed Doors

What is the Maximum gate width using pressure treated 2x4’s and fence slats

How can that work on any size gate? I am looking for an easy way to replace a gate across my driveway. Hinges look too small.

Are the screws also Powder coated?:

Is there a device that is included that makes the Gates swing open