The Seco-Larm SD-991A-D1Q is a compact, fail-secure electric door strike that upgrades standard cylindrical locks into access-controlled solutions—no cutting required. With a sleek, reversible design and easy two-wire setup, this strike is ideal for office doors and tight-fitting metal frames.

• Transforms cylindrical locks into electronic access systems without cutting

• Fail-secure operation keeps the door locked during power loss

• Includes no-cut stainless steel and low-cut aluminum strike plates

• Simple 2-wire, non-polarized installation for quick setup

• Durable stainless steel keeper and solenoid-powered mechanism for long-lasting performance