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 an Air Nailer that is 20 percent smaller while boosting power by 10 percent, so it can drive nails into hardwoods like walnut with less pressure than other guns. Instead of reserving some of the compressed air for resetting the piston, which weakens the strike, the tool uses all of the air’s energy to drive the nails. A vent exhausts the air, and a second burst returns the piston. Since our Coil Nailer can operate at lower pr