Features:Long service life time due to low friction, low operation noise.No stick-slip effect, heats up less, reduced drive power required.Low frictional loss, high transmission efficiency.There are a lot of balls rolling movement between the screw shaft and ballscrew nut, they are able to get a higher efficiency of movement. Helpful in saving.Ballscrew used the ball movement, so the starting torsion is very small, doesn't appear a sliding motion creeping phenomenon, can ensure accurate positioning. Specifications:Total Length: 400mm / 15.75inchScrew diameter: 12mm / 0.47inchScrew pitch: 4mm / 0.16inchColor: SilverWeight: Approx. 367gPackage Included:1 x Rolled Ballscrew (400mm)Note:Please allow 0-1cm error due to manual measurement. Thanks for your understanding