Pneumatic nailers can slash the time it takes to fasten everything from window trim to roof rafters. The basic guts of the tool haven’t changed since the 1960s: Compressed air pushes a piston that drives a rod, forcing nails deep into wood, before the tool resets for the next nail. Now Bosch has figured out how to make a nailer that’s 20 percent smaller while boosting power by 10 percent, so it can drive nails into hard woods like walnut with less pressure than other guns.
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