Impact Wrench, Manufacturer suggested retail price. $4760.39 1" Super Duty Air Impact Wrench This is the most powerful 1" wrench for spring work, tractor pads, bus maintenance, and off-road and farm equipment work. The built-in pressure-feed lube system protects the unique twin hammer impact mechanism as it delivers the ultimate in power. Up to 2,000 ft.-lbs. of torque Most powerful 1" wrench Long-lasting tool Handle exhaust Manufacturer: Ingersoll Rand 90 day warranty on material and workmanship