Seco-Larm SD-991A-D1Q Mini No-Cut Electric Door Strike.

Features

• Converts cylindrical lock sets into an electronic access-controlled locking system
• Fail-secure operation – Door remains locked if power to the strike is lost
• 2-wire installation, non-polarized connection
• Stainless steel keeper for strength and long life
• Includes Stainless Steel No-Cut and Silver-Colored Aluminum Low-Cut* Strike Plates
• Can be used with virtually any cylindrical door locking system
• Can be used with an optional digital keypad, pushbutton switch, and other entry devices.
• Suitable for office-type applications
• Reversible non-handed design fits either right-hand or left-hand doors
• Shallow design for use with most metal doors
• Powered by a solenoid, not a buzzer coil
• For indoor use​