Numa offers a full range of HDD rock drilling systems including hammers, bits, side load sonde housings, bent subs, and adaptors capable of drilling holes 4” to 7-1/2” (102 mm to 191 mm) in diameter. With deep experience in rock drilling, Numa purposely designed their HDD hammers to drill longer in difficult rock condition. Our products feature a single bore design that allows for a maximum bore diameter in conjunction with providing optimum life against abrasion. Delivering industry-leading ste