The 4 series centerline strike accommodates ¾” latch projections. Its various faceplate options and 1-1/2” cut-out depth accommodates most door frame types and materials. Installation is simple with standard mounting tabs and included fasteners. Crossed wires are never a problem, as the coil is not polarity sensitive. The RCI 4 series centerline strikes are available with an optional 1-1/2 hour fire-rating. 41 Series depicts fail-secure and 43 Series depicts fail-safe.