Has anyone found gears that fit the shaft? The ones shown in "frequntly bought together" are for smaller round shafts.

for anyone looking for this, 5mm shaft, its "flat" part fits a rectangle 3mmx5mm.

Could i use the driver to control a slightly bigger pm55l-048? i would probably need to push 19v through the uln2003.

Yes, you can use the driver to control pm55l-048, the maxmum voltage of ULN2003 can reach 24V.

what is it supposed to do?

It, or they, do nothing - - until you connect a smart source of drive signals. The included "driver boards" are electrical signal drivers to boost the strength of those signals. You might connect these boards between the motors and an Arduino or a Raspberry Pi or some manual speed control circuits for the stepper motors. The signals have to be the rippling sequence of logic pulses needed by the stepper motors. Because these motors have 64:1 gears, you program 64 sequences to get the shaft to go one full turn. Naturally, the gears trade off speed (RPM) for strength (torque) of turning. They also gain precision of output shaft position, which can be moved in STEPS, or fractions, of 1 sixty-fourth of a turn. If your only interest is in speed control, not positioning, you may want to look into DC motors (or gearmotors) and 'H-bridge drivers' and PWM (Pulse Width Modulation) controls.

ELEGOO 5 Sets 28BYJ-48 ULN2003 5V Stepper Motor + ULN2003 Driver Board for Arduino

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