High-strength forged jaws 40% lighter than standard cast iron wrenches to reduce fatigue 140% to federal specification for maximum strength and durability Crescent aluminum pipe wrenches are perfect for numerous plumbing and MRO applications. They exceed the federal torque load specs by over 140%. In addition, they feature a two-start adjustment thread pitch for twice as quick pipe wrench adjustment. Crescent aluminum pipe wrenches have been strategically designed to cut weight, hitting the scales at over 40% lighter than their cast iron brethren. Adjustment ring thread pitch angled for 2x faster opening and closing of wrench jaw 40% less weight helps reduce user fatigue Handle shape optimized for maximum power and user comfort High strength forged jaws .