A multi-use wrench used for installing the screws nut of the mobile platforms and other tasks is the cross wrench. Much like a four-way tire iron, the cross wrench usually has one arm that is longer making it shaped more like a cross than an X. There are usually different size tools at the end of the arms.
This medium cross wrench works with 4mm,5mm,5.5mm,6mm outer diameter screw nuts or hexagonal screws. Compared with the small cross wrench, the longer arms make it easier to hold and fix.