A bracket for mounting an expansion card to different slots of enclosures is disclosed. The bracket includes a base for attaching the expansion card thereon, a pair of rails attached on the base, a sliding element being slidably connected between the rails, a connecting element fixed to the sliding element and a locking element slidably connected to the sliding element. The sliding element is movable on the base between at a first position where the connecting element is received in the base and a second position where the connecting element is spaced from the base. The locking element is movable relative to the sliding element to fix the sliding element to the base or release the sliding element from the base.