YS-138NO-S/YS-138NC-S series is an ANSI standard heavy duty electric strike. With a dimension of 124 millimeters (L) x 32 millimeters (W) x 33 millimeters (H), it uses stainless steel. Dual voltage is DC12 volts and current draw is 250 mA. For YS-138NC, fail safe is locked when energized?F for YS-138NO, fail secure is locked when unenergized. Built-in voltage spike suppressor offers safety function. Opening mode supports 90-degree swinging door. Suitable for wooden door, glass door, metal door and fire-proof door, the series has passed authority certification of CE & MA. YLI provides quality guarantee for three year s except man-made breakage and force majeure.