Aiskaer 6 Sets New Stepper Motor (5v Dc 4-phase 5-wire,28byj-48)+ Uln2003 Driver Board A, B, C, D four-phase LED indicates the status of the stepper motor work Stepper motor with a standard interface Drive Module Board Size:1.26 inchsX1.38inchs Motor diameter: 1.1 inches.Wire length9.05 inchs,Stepping angle: 5.625 x 1/64.Reduction ratio: 1/6 100%Quality assurance, if there is any quality problems we will immediately full refund