Ryobi PCL220K1 18V ONE+ hammer drill kit

Torque is the twisting force the tool can apply, usually listed in in-lbs or ft-lbs. Higher figures help with large fasteners, augers and hole saws. Ratings from different makers are not always measured the same way, so treat this as a rough guide rather than a direct comparison.

Max speed is the top no-load speed, in RPM for rotating tools. No-load means the tool is running free, so speed drops once it is working. On drills, many makers list a figure per gear: high for small bits, low for control with large bits or long screws.

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.

The clutch slips at a set torque so screws are not overdriven, stripped or sunk too deep. More settings give finer steps of adjustment, useful for small screws, soft materials and cabinet hardware. A drill mode usually bypasses the clutch for full torque when drilling.