The 28CM Lead Screw Stepper Motor from Pololu is a type of motor specifically designed for high precision and reliable positioning. This stepper motor has an 6 mm diameter shaft, 2-phase stepper motor with a 2-phase, unipolar winding, 200 steps per revolution (1.8° per step), and 28 cm lead screw. It features a 200-step resolution, an easy to use 4-pin interface, and an included lead screw and nut assembly. This motor is perfect for applications that require smooth, precise and repeatable motion such as 3D printing, medical instruments, or robotics. The 28CM Lead Screw Stepper Motor is compatible with a wide range of microcontrollers, including Arduino, and can be driven with any of the Pololu step motor drivers. The included lead screw and nut assembly is great for applications that require even more precise positioning, such as those found in medical equipment, robotics, or 3D printing.