A slide rail includes a first slide and a second slide received in the first slide. The first slide includes a first main plate and two first side parts symmetrically placed on two opposite sides of the first main plate. The second slide includes a main body, an extending body received in the main body, and a slide post. The main body includes a second main plate and two second side parts symmetrically placed on two opposite sides of the second main plate. The second main plate includes a fixed hole defined therein. The extending body includes a third main plate and two third side parts symmetrically placed on two opposite sides of the third main plate. The third main plate defines a rail therein. The slide post is passed through the rail and fixed to the fixed hole.