The FSH-FES20M is part of the patented FES20 series of high security electric strikes that are manufactured from stainless steel, accept voltages from 11 to 30V DC and have a simple and unique Power To Lock (PTL) / Power To Open (PTO) field interchangeable mechanism. All FES20 strikes come with a 10mm strike lip as standard, have pre-drilled threaded cavities for extension lips and are available in monitored and non-monitored models. Included with a mounting kit and no loose screws or pins, installation is a breeze.