These pneumatic-powered tools create a compact hole that allows contractors to install underground gas, water, cable, irrigation, fiber or electrical lines under yards, buildings or streets with minimal disruption. HammerHead Mole® piercing tools are some of the most reliable in the industry today. With more than 24 models ranging from 2" to 8" (50 to 200 mm), HammerHead® Trenchless has a piercing tool to meet your needs in any ground condition.