Numa offers a complete selection of DTH hammers and bits for the foundation industry. Capable of drilling holes from 3½- to 50½-inches (89 to 1,283 mm) in diameter, Numa’s dilling products provide the right combination of speed and life to excel in hard rock and overburden formations. Numa’s Super Jaws Overburden Bits deliver unmatched performance for simultaneous drilling and casing. With one-pass drilling and no tools left down the hole, drillers save considerable time and money.