SOViK 2" 2 inch Stroke Micro Linear Actuator,12V DC Speed 1" per sec Built in Limit Switch, 22lbs Maximum Lift Includes Mounting Brackets

It's the Fastes Accuator I've ever found! But it's only 2" !!If that is what you are in need of buy it..

Actuator moves very smooth and is built very strong. Used this to automate my tow behind spreader slidegate.Very happy with my purchase!