If you buy tools for a fleet shop, a heavy equipment dealer, a mining or construction operation, or a government motor pool, you have probably had this conversation: which impact wrench do we actually need? The answer almost always starts with drive size. Get the drive size right and everything else, the sockets, the hose, the compressor, falls into place. Get it wrong and you end up with a gun that is too weak for the job or too heavy to use all day.

In this post I am going to walk through the Genius Tools air impact wrenches we carry at OTR Pro Direct, from 3/8 inch up to 1-1/2 inch drive, using the specs straight from the product pages. Genius Tools is professional-grade equipment at a value price, and these guns are backed by the Genius Tools Limited Lifetime Warranty against manufacturer defects.

Why drive size matters

Drive size is the square on the end of the anvil. It sets which sockets fit, but it also tells you what class of work the tool was built for. Bigger drive, bigger fasteners,

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