Zentry offers the Burglarybuster range of products for securing Double French Door locks: The Burglarybuster 1 and Burglarybuster 3 for all double french doors.
Burglarybuster 1 French Door Lock for opening-outwards French doors
A security threat found in most French doors.
Burglarybuster 3 security lock for all opening-inwards French Doors.
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Burglarybuster 3, Zentry
How to Secure Single and Double Handled French Doors
Burglarybuster 3, Zentry
Burglarybuster 3 security lock for all opening-inwards French Doors.
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Zentry, Secure French Doors with Burglarybuster