Most multi socket surge protectors on the market have a tendency to move or wobble when you insert or remove a plug under a unique patent this protector has four adjusting screws located in the back to make it fast and secure whether using bulky protruding industrial sockets or a normal household socket it comes with four adjustable screws in 25 and 55mm lengths to secure it in virtually any socket without the need for drilling its an essential piece of kit to protect home and office comp