These rigs had 1,000-hp drawworks, 1,600-hp mud pumps, 500-ton top drives, 1,365-kW generators, 5.0-inch drill pipe, and 750,000-pound capacity masts. The rigs used range II drill pipe to build stands (triples) with a rack-back capacity of ~15,000 feet, and had the ability to walk ~20 feet an hour with a rack full of pipe.