The 42BYGHM809 is a great way to get things moving, especially when positioning and repeatability is a concern.
Features:
- Step Angle (degrees) : 0.9
 - 2-Phase
 - Rated Voltage: 3V
 - Rated Current: 1.7A/Phase
 - 5mm Diameter Drive Shaft
 - Holding Torque: 48N.cm
 - NEMA 17 form factor
 - Length: 48mm
 - Width: 42mm