Milwaukee 2730-22 M18 FUEL circular saw kit

Blade diameter mainly sets how deep the saw can cut. Larger blades cut deeper, which matters for 2x lumber at a bevel and for thicker stock. Check the maker's listed cut depth at 90 and 45 degrees, and buy replacement blades in the stated diameter.

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.

Max bevel is the largest angle the shoe can tilt for angled cuts, measured from square (0 degrees). Most saws reach at least 45 degrees; some go further, which helps with roof and stair work. Positive stops at common angles make repeat cuts quicker and more consistent.

Arbor size is the diameter of the shaft the blade mounts on, and the blade's center hole must match it. Many circular saws use a 5/8-inch arbor, but some smaller saws use other sizes. Check this before buying blades, and never force or shim a blade that does not fit.

Tool-only weight is the bare tool without a battery, as listed by the maker. Add the battery weight to estimate what you will actually hold, since larger packs add noticeably. Weight matters most for overhead, ladder and all-day work. Makers do not always measure weight the same way.

Brushless motors use electronic control instead of carbon brushes, which generally means less wear, less heat and more runtime per charge. Brushed motors are simpler and often cheaper, and are fine for lighter or occasional use, though their brushes can wear out over time.

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.

Tool length is the front-to-back measurement published by the maker. A shorter tool fits between studs, joists and inside cabinets more easily; standard US framing is 16 inches on center, leaving about 14-1/2 inches between studs. Check whether the figure includes the chuck or bit holder.

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.