Dc 4-9v 500mA 2 Phase 4 Wire Drive Stepper Motor Screw with Nut Slider Step Angle 18&deg; Working Voltage DC4-9V 500mA, not over 12V DC Size 105X15mm/4.31" X 0.59"(L*W) ; Screw Length 90mm screw Diameter 3mm Slider Width 15mm Effective Stroke 80mm Screw Pitch 0.5mm Step Angle 18 Screw thread pitch: 0.5mm (a step moving 0.025mm, as required for smaller can be used to segment the driver) The speed of a straight line is the maximum 25mm/s