Mahowald Services, LLC. Pentruder 8-20 High Cycle wall saw operates on high frequency electric power and can produce 31 horsepower at the blade shaft. Using a 4 speed gear box, the Pentruder 8-20 will spin blades from 32" to 78". This allows full use of the 31 horsepower motor, simply by shifting gears. The Pentruder has a 36" sawing depth capacity. Electric power is provided by the Mahowald Services, LLC. generator or can be wired into existing building 3 phase power.