A post hole digger is a tool used to dig narrow holes to install posts, such as for fences and signs.
A post hole pincer (pictured) is jabbed into the ground in the open position until the blades are buried. At that point the handles are pulled apart to close the tool and grab the chunk of soil loosened. They are then pulled out of the ground with the chunk of soil. The process is repeated until the hole is deep enough, or until the hole is so deep and narrow that the handles can no longer be pulled apart fully.
Can make holeof 1 metre deep and 2-14 inch wide.
Depending upon the soil conditions can make 45 to 60 holes per hour.