Through our hydraulic concrete breaker-based design, posts are driven by jackhammering them into the ground. You maintain full control of the post while driving at a rate of 800 blows per minute. The domed cup design enables you to push and pull the post straight, and the attached chain serves as a plumb bob and depth gauge. Because all moving parts remain above the post, our design also allows the user to reach over an existing fence to drive posts on the other side.