This post driver is a power house! With a 1250 foot pound energy class breaker weighing 1300 pounds this post driver will have enough power behind it to get your larger 8 inch post in the ground. Working pressure is 2200 psi. The blow rate is 600 to 900 blows per minute these drivers come with a lifetime warranty and it comes with a toolbox with a nitrogen recharge valve kit and wrenches.