Description:<br />JKM Nema 17 0.9 Degree 42 Two Phase Hybrid Stepper Motor 40mm 1.68A For CNC Router<br /><br />Specification:<br />Brand: JKM<br />Model Number: JK42HM40-1684<br />Diameter of axle: 5mm<br />Motor length: 40mm<br />Boundary Dimension:42*4