Allen screw with a diameter of 4mm and a length of 12mm. It features a head with an internal hexagonal configuration and tightens or loosens with a hex key or Allen wrench. It has the advantage of offering very good grip when used with the corresponding hex key or Allen wrench. It can also be used more easily in hard-to-reach places. It is ideal for use in outdoor areas or environments with moisture, as it is made of stainless steel.