Heavy Duty Straight Pipe Wrench, Steel Jaw, 18 in ORS NASCO and large knurled feed screw and large knurled feed screw knob give easy control of cutting pressure for clean cuts Models 117 and 118 include a self feeding AUTOFEED® cutter wheel that automatically cuts after tightening the knob only once Model 118 features a special knob for easier tightening of the feed screw Longer life than thoriated electrodes Non radioactive additives Can be used in both AC and DC processes Excellent arc starting and stability Reduce amperage by 5o recalibrate from other tungsten Instant grip release Heat treated replaceable jaw Easy spin nonstick adjustment nut Fully floating forged hook jaw Replaceable hook and heel jaws