National Oilwell Varco (NOV) Borehole Enlargement offers the broadest, most comprehensive range of tools that provide proven technology for the industry’s most complex, diverse and challenging hole opening applications. Whether you need a fixed blade string tool, a Bi-Center bit, or a concentric underreamer, NOV Borehole Enlargement offers the optimal solution for all BHA types: steerable motor, straight motor or rotary, and closed loop rotary steerable (point the bit and push the bit).