Montana 1000e Post Driver With Auger Kit + T Rex 350e post driver. The ultimate package for a fencing contractor. The Montana 1000e comes with 8” ID post cups domed and flat bottom, 4 ft rock spike, concrete breaker point. This unit has 4” rock auger pilot kit. The T. rex 350e is your t post driver as the large one is hard to drive T post with. It can also do up to 4” pipe. Sta307.com