AST Double Door Security Lock, French Door Lockout Device - Keys

In this review of the AST Double Door Security Lock the bottom line is simple: it is a practical indoor barricade for households that need extra reinforcement on double or French doors. The reviewer found it most valuable when a removable, no-drill solution was required to prevent unauthorized opening from inside - for example to secure closets, utility rooms or as a childproofing measure. The single biggest reason to buy is the solid diecasted aluminum construction combined with a keyed cylinder and three keys for controlled external access.

Key Features

• Sturdy and Durable Double Door Lock: The diecasted solid aluminum alloy unibody delivers a reassuring feel of durability for daily use as a double door barricade.
• Keys Included: Three keys are supplied so the lock can be used both as an internal safety device and for controlled external access when needed.
• Suits Knobset and Handleset: A wide range of adjustment lets the device fit most knobset configurations and some handlesets without drilling.
• Portable and Removable: The unit works as a temporary, no-drill lock you can add or remove as circumstances change, making it useful for renters or short-term needs.
• Indoor and Some Outdoor Use: Designed primarily for indoor reinforcement, the cylinder and keyed function also make it useful as an additional layer of security on sheltered exterior doors.

Who It's For

The AST double door lock is best for homeowners or renters who need a non-permanent, visible reinforcement for double doors and French doors, where an extra keyed barricade on the inside is desirable. It is especially useful for families who want to childproof closets or prevent casual opening of French doors without modifying the existing handleset.

People who need a certified primary entrance lock or who require a recessed or embedded deadbolt should look elsewhere, since this device is intended as an extra layer of security and not a substitute for a primary handleset or commercial-grade exterior lock.

Pros & Cons

Pros

• Solid aluminum unibody construction offers notable sturdiness and longevity.
• Three keys included provide flexibility for internal and external use.
• Adjustable fit works with most knobsets and some handlesets and installs without drilling.
• Portable and removable design is convenient for renters or temporary needs.

Cons

• Locking action can be stiff for some users, making the slide-in locking part harder to operate.
• Not a replacement for a primary exterior deadbolt from a security certification standpoint.

Specifications

Our Verdict

The AST Double Door Security Lock is a sensible, good-value reinforcement for homeowners who need a removable, keyed barricade for double or French doors. Its solid construction and included keys make it a reliable secondary lock for closets, interior double doors and sheltered exterior openings, though it should not replace a certified primary entry lock.

Frequently Asked Questions

Will this fit standard French door knobs?
The lock is designed with a bigger range of adjustment and fits most knobsets and some handlesets, but verify your door dimensions before purchase.

Is drilling required to install?
No, the device is removable and intended to be used without drilling or permanent modification.

Can it be used outdoors?
It is primarily for indoor reinforcement but can work on sheltered exterior doors; it is not a substitute for a primary exterior deadbolt.