Milwaukee 3497-22 M12 FUEL hammer drill + impact kit

This lists how many batteries come in the box, if any. Tool-only (bare) listings include no battery or charger, which suits buyers already on that battery platform. Two batteries let you charge one while working with the other.

Amp-hours (Ah) is the battery's charge capacity. At the same voltage, a higher Ah pack runs longer between charges but is usually larger and heavier. Smaller packs keep the tool lighter for overhead and light work; larger packs suit saws, grinders and other high-draw tools.

This states whether a charger is included and which type. Chargers vary in output, so the same battery can take noticeably different times to charge on different chargers. Tool-only listings usually include no charger.

Hammer rate, in blows per minute (BPM), is how often the bit pulses forward while drilling in hammer mode. It matters for drilling brick, block and concrete. Hammer drills suit occasional masonry holes; frequent or large holes in concrete usually call for a rotary hammer.

The chuck holds the bit. A keyless chuck, sized by the largest shank it accepts (often 3/8 or 1/2 inch), tightens by hand and takes round or hex shanks. A 1/4-inch hex quick-change collet, used on impact drivers, takes hex-shank bits only and allows fast one-handed bit changes.

This is the maker's published warranty term. Terms for tools, batteries and chargers often differ, and some depend on registration or exclude certain uses. Read the maker's terms for what is covered, how claims are handled and whether proof of purchase is required.