Electric strike 118FRR Product description Model with monitoring contact as potential-free changeover contact, actuated using a lever on the latch bolt. Also useable as a heavy-duty electric strike. Overview of Advantages Radius keeper, FaFix®, adjustable by 3 mm FaFix® latch adjustable in 0.5 mm increments Universal voltage Symmetrical design. DIN left/right as well as horizontal applicable Bipolar diode Related products Electric strike 118FFaFix® adjustment range, Fail-locked, Bi-directional diode