The motor of a worm drive saw is located slightly to the rear, meaning its internal gears run perpendicular to each other. That gives the tool more power than its direct drive “sidewinder” relatives, at the expense of RPM. The tool’s narrow, elongated shape also lets you cut in tight spaces and provides extra reach when ripping wide sheets of wood. Plus, its blade is positioned to the left, so righties will be able to see where it’s cutting. The cordless part is clutch here: It’s hard to unplug with a worm drive because the gearing requires more oomph. Skilsaw found a way, though, by developing its own powerful battery.