Seco-Larm Metal Electric Door Strike Fail Safe/Secure 5 X 11/4 X 11/4 Inch Symmetrical-Sized Seco-larm Metal Electric Door Strike - Fail Safe/Secure. Reversible for right or left hand doors. Shallow design allows for use in most metal doors. Solenoid activated not a buzzer coil; 12VDC. Symmetrical-sized; Jaw strength is 2000 lbs.