Description:
This is a decent and low cost unipolar stepper motor. It has a reasonable torque and a good speed for small to medium projects.

Specifications:

• Motor Type: Unipolar Stepper
• Manufacturer Part Number: PM42L-048-17
• Step Angle: 7 1⁄2°
• Step Accuracy: 7 %
• Holding Torque: 950 g·cm
• Rated Torque: 710 g·cm
• Maximum Speed at Rated Voltage: 240 RPM
• Rated Voltage: 12 V DC
• Rated Current: 280 mA
• Coil Resistance: 43 Ω
• Shaft Diameter: 3 mm
• Weight: 138 g
• Number of Leads: 6 wires
• Wire Length: 300 mm

Resources:
Stepper Motor and Controller Primer
Wantai Data Sheet