ITEM NAME:5PCS Mini 4mm 2-Phase 4-Wire Stepper Motor DC 5V Precision Stepping Mo %o Specification: Motor outer diameter : 4.4 MM Motor height : 8.7 MM Motor shaft diameter: 0.7 MM (flat position 0.45 MM) Output shaft length: 1.2 MM Weight : 0.7 grams Model : Two-phase four-wire Driving voltage : DC5V (estimated) Internal resistance: approximately 14.2 ohms 5V short circuit current : 0.26 A Note: The use of these motors requires a professional level.We can't provide technical support,please buyers make sure that you can use the motor by yourself. The motor not used before, but due the.5PCS x Stepper Motor. 5V short circuit current : 0.26 A. Output shaft length: 1.2 MM. Motor height : 8.7 MM.