Post hole diggers are tools used to create deep holes in the ground, primarily for setting fence posts or planting trees. They typically consist of two handles and two blades that open and close to scoop out soil. This design allows users to dig narrow, deep holes efficiently. These tools come in various sizes and types, including manual and powered versions. Manual post hole diggers require physical effort, while powered options, like auger machines, can make the job easier and faster. They are essential for construction and landscaping projects, ensuring stable and secure installations.