underreamers

Rock-Tech International

(817) 473-0500

12617 E FM 917 Ste A, Alvarado, TX, 76009, USA

David Griffin

Offers 21st century rock DTH technology to the water well, oil/gas, civil construction, and mining industries. Standard/custom designs are standard, dyanite and diamond carbide hammer bits (3″-46″), hole openers in all sizes and shanks, drag bits, drill pipe, the workhorse “Stone Krusher” line and premium “Stone Warrior” line of percussion hammers (2″ through 30″).Read more…

Numa

(860) 923-9551

646 Thompson Rd PO Box 348, Thompson, CT, 06277-2214, United States

Neal Kuszewski

Numa is the world’s leading drilling technology provider, dedicated to ongoing product innovation and result-oriented consistency. We’ve built a strong legacy of high quality, U.S. made DTH hammers and bits for drilling holes 3 1/2 – 50 1/2 inches (89-1283 mm) in diameter.Read more…