• Twin Hammer mechanism. • Directional smelting manufacture, light and durable, high power. • Easy adjustable power regulator. • ldeal for general repair on cars， tires, and heavy equipment. https://www.zjzmtools.com/product/1-2-inch-pneumatic-tools/zm3900b-heavy-duty-3-4-high-torque-composite-pneumatic-wrench-tools.html