The Series 2i 450 has a 4.5m Hydraulic hinged mast which allows for increased hammer speed & driving force.  It's capable of installing posts up to 12ft in length.

The Expander 2i takes usability and speed to the next level with a fully telescopic mast.
Starting at 3.2m, the mast can be extended to a massive 5.0m to drive in posts of virtually any size.

The Kinghitter Spitfire Type-R is built to set a new benchmark in percussion-style post driving. Its fitted with a 3.0m rigid mast, allowing you to drive posts up 8.5 ft in length.