The F1 series of centerline strikes are made of stainless steel and feature a faceplate with square corners. The RCI F1114 is ideal for hollow metal frames and the RCI F1119 is best utilized with aluminum and wood frames. These centerline strikes are saddle-mounted for enhanced strength and allow up to a 1/4'" horizontal adjustment to relieve side-load pressure and ensure proper latch alignment. The RCI F1 Series electric strikes are built with a unique anti-vibration feature built-in and a "Pry-Guard" for tamper-resistance.