50pcs DC 1.5V-3V 4 Wire 2 Phase Micro Stepper Motor with Output Copper Gear Miniature D8mm x H9.2mm

Here's what I figured out for these steppers to assist others so far.- You get 25 assemblies of 2 bipolar steppers grouped on a 8 pin tiny connector. 50 stepper motors total. Wire lengths and colors vary motor to motor.- Removed the tiny pins from the connector and attached to 2.54mm spacing header pins for breadboarding. Wires are delicate, so suggest to keep the terminals on and solder to those with low heating.- Drove stepper with arduino and A4988 driver module, A4988 Vref set to 50mV (should be ~100mA coil current). At Vref set to 20mV (~40mA), the stepper wouldn't step consistently, but just vibrated back and forth.- Experimented with the stepper coil wiring arrangement for 4 pins on each stepper. I came up with correct rotation direction and operation as shown in the image. Follow the wire position, not colors, as wire colors vary motor to motor.- Each motor has 2 threaded mounting holes. They look slightly larger than M1, I'm guessing M1.2. Ordered some screws to try and figure that out.

It certainly would have been very considerate to include electrical wiring instructions.