Which is better for drilling concrete?

The 2904-22. It is rated to 5/8 in. in concrete with 33,000 BPM, while the 3404-21 is a light-duty 12V hammer drill with no published concrete capacity.

Which is better for driving screws overhead?

The 3404-21. At 6 in. long and on a 12V pack it is easier to control one-handed in tight or overhead spots.

Is the 2904-22 worth the extra money?

Yes if you drill large holes or work in masonry regularly. For occasional light drilling, the cheaper 3404-21 covers it.

Do they share batteries?

No. The 2904-22 uses M18 packs and the 3404-21 uses M12 packs, so each kit's batteries only fit its own platform.

Both use brushless POWERSTATE motors. The 2904-22's all-metal ratcheting chuck and higher-duty drivetrain are built for heavier daily use.

How many batteries come in each kit?

The 2904-22 includes two 5.0 Ah batteries and a charger in a hard case. The 3404-21 includes one 2.0 Ah compact battery and a charger.

Milwaukee 2904-22 M18 FUEL 1/2" Hammer Drill/Driver Kit vs Milwaukee M12 FUEL 1/2 in. Hammer Drill/Driver Kit 3404-21

Buy the 2904-22 if you drill concrete, large holes, or self-feed bits all day; its 1,400 in-lb of torque and 33,000 BPM hammer rate do work the 12V tool cannot. Buy the 3404-21 if you mostly drive screws and drill small holes overhead or in cabinets, where its 6 in. length and lighter 12V pack matter more than power. The 2904-22 is $351.99 at Horizon Supply Company as of November 3, 2026; no current new price was given for the 3404-21.

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