This DC gearmotor has an integrated threaded rod as its output shaft, turn it into a linear actuator.Gear motors are primarily used to reduce speed in a series of gears, which in turn creates more torque.Full metal gears would ensure a longer service life, high torque and less noise.Gear motors can be found in many different applications, and are probably used in many devices in your home.Micro-type geared motors are widely used in office automation, home automation, production automation, safety equipment, consumer electronics, aviation models, automotive electronics and more.Voltage: DC 6VSpeed: 30RPMOutput Shaft Length: 55mm / 2.16inchOutput Shaft Diameter: M3colour: silverMaterial: metalPackage Contents:1 x Gear Motor (6V 30RPM)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.