For hollow metal or wooden frames. RCI’s “all-in-one” 6 Series Electric Strike combines several key features for a versatile end-user experience. Comes with field-selectable lock mode – choose fail locked or fail unlocked with the turn of a dial. Also includes field-selectable voltage input – accommodates 12VDC, 24VDC, 12VAC, and 24VAC in one strike. Works with cylindrical locks, mortise locks, and mortise exit devices.