Feature: 1. Stepper motor linear can be used in DIY small slider/project/measurement equipment/laser printer 2. This miniature 2‑phase 4‑wire stepper motor come with planetary gearbox, planetary gearbox reducer adopts all metal structure 3. You can drive accurate diagonal lines to move the metal slider up and down, the bracket is basically made of metal structure 4. Using high class materials with good quality to guarantee stable performance and high working efficiency 5. Come with advanced technology with fine workmanship, which is a necessary linear moving parts Specification: Item Type: Stepper Motor Linear Motor Type: 2-Phase 4-wire Drive Voltage: 4-9V/100-500mA (the higher the voltage, the greater the force, the greater the heat) Screw Length: Approx. 90mm / 3.5in Slider Stroke: Approx. 80mm / 3.1in Motor Diameter: Approx. 15mm / 0.6in Screw Diameter: Approx. 3mm / 0.1in Optical Axis Diameter: Approx. 3mm / 0.1in Screw Pitch: Approx. 0.5mm / 0.02in Step Angle: 18° Phase Resistance: 15.5 ohms Overall Size: Approx. 105 x 15 x 18mm / 4.1 x 0.6 x 0.7in Blue: A+, Black: A-, Red: B+, Yellow: B-. Package List: 1 x Stepper Motor Linear Note: Note that it is a stepper motor, does not turn when directly connected to the power, a stepper motor driver board and control board are required.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.