RECENT ADVANCES HAVE MADE THESE TOOLS MORE POWERFUL AS WELL AS LIGHTER AND QUIETER.The air impact wrench is one of those tools that, when it found its way into farm shops, soon proliferated not only in numbers but also in sizes. The first impact wrench you purchased, likely a %-inch anvil tool, readily proved its indispensability, so much so that it led to the purchase of a more powerful ^-inch impact and then an even more powerful 3/4-inch gun.The size of an impact wrench's anvil (that square driveshaft that accommodates sockets) is the leading indicator of an impact wrench's working power. Manufacturers do list the tool's maximum (working in reverse) and working power in terms of foot-poundsof torque.
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