Length Pls notice:

shaft are not same lenght on both sides!!!!

front shaft is 5mm diameter shaft,20mm lenth; 

back shaft is 5mm diameter and 10mm length

(42BYGH40-1704A,1.7A, 0.45N.m holding torque)

2-Phase 4-Wire (BLACK: A+ GREEN: A- RED: B+ BLUE: B-)

Package Includes:

1x 42 Stepper Motor 12V