Description: Planetary Gear Stepper Motor: Mini planetary gearbox 2-phase 4-wire stepper motor provides great torque and enables the -fine step resolution Driver Required for Operation: 2-phase 4-wire stepper motor that requires an external driver board (not included) to function. It cannot be connected directly to a power source Compact & Metal Build: Engineered for reliability, the entire unit is constructed from metal. Its micro design, makes it ideal for integration into robotics, small DIY projects, and automation systems High Precision Linear Motion: The stepper motor assembly features a precision slide, passes through the planetary reduction box and then drives the driver to move the slider up and down Optional: 6mm Motor: The maximum stroke is about 30 mm, which is about 5800 pulse signals to complete the stroke; 8mm Motor: The maximum stroke is about 33 mm, which is about 6180 pulse signals to complete the stroke Specification: Motor Wire Length: Approximately 10cm Motor Internal Resistance: Approximately 13.2 Ohms 5v Short-Circuit Current: 0.32 A Size Chart:8mm Motor Assembly: 6.05cm/2.38inch Package Includes: 1 Micro Planetary Gear Stepper Motor Assembly Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.