The 9800 Series Electric Strike exceeds Grade 1 standards for strength and performance. All functions are performed within the 1/2" thick strike body, which is protected by a sleek stainless steel cover to conceal the mounting screws and provide the most aesthetic appearance. All while being field selectable for fail secure or fail safe operation, and dual voltage, 12 or 24 VDC.1/16" and 1/8" spacer plates are provided to accommodate varying door gaps. Simply place the electric strike on the surface of the frame, align it with the Starwheel or Interlock latching mechanism, and install.