GarageDoorSecurity GD400 Deadbolt Kit vs SureLock Automatic Garage Door DeadBolt

Both are automatic deadbolts that lock and unlock with your sectional door, and both need about 2 inches of clearance and work with any opener. The GarageDoorSecurity GD400 is the clearer buy: it ships as a full kit with a 25 mm hardened steel bolt, a 12-month warranty and UK origin, and owners report easy DIY install. The SureLock is the better pick only if you want a manual release and a drill-hole template, which it lists and the GD400 does not. Neither is a smart lock; both rely on your opener's battery backup during a power cut.

• Choose the GarageDoorSecurity GD400 if you want a complete kit with a hardened 25 mm steel bolt, a stated 12-month warranty and a manual-free automatic lock tied to your opener.
• Choose the SureLock if a manual release and a drill-hole template matter to you, or you want a brand with a named model line for matching parts.