Longruner 5X Geared Stepper Motor 28byj 48 Uln2003 5v Stepper Motor Uln2003 Driver Board for arduino LK67 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: 1/64.