This is Nema17 planetary geared stepper motor. Integrated Planetary gearbox with a 1:14 gear ratio at rated torque of 45Kgcm at 20RPM. 

Motor Specifications:

• Step Angle : 1.8 Degree
• Configuration: 4 wire stepper motor
• Holding Torque:  45Kgcm
• Rated Voltage: 2.8VDC
• Rated Current: 1.68Amps
• Moment permissible Toruqe : 50Kgcm
• Rated Speed: 300RPM
• Motor length without Shaft: 84mm
• Gear box lengh(L) : 38mm
• Shaft Length: 22mm
• Shaft Dia: 8mm
• Back shaft Length: 8mm 
• Back shaft Dia: 5mm
• D-cut Length: 15mm 
• Gear Ratio: 1:14
• Efficiency: 0.71% 
• Weight: 564 grams 

Wiring Details:

• A+ = Black 

• A-  = Green

• B+ = Red

• B-  = Blue

Datasheet