I. For Petroleum /Natural Gas Exploration and Development
Model: 8 1/2 " 8 3/4 " 4 wings 5 wings 6wings
II. For Geological exploration and Mining
***** Bits Model: φ75 φ94 φ113 φ133 φ146 φ152 φ171 φ219 φ273
*****-hole Bits Model: φ75 φ94 φ113 φ133 φ152
iii .PDC anchor Bits Model: φ28 φ32 φ42