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 3 security lock for all opening-inwards French Doors.
High-Security French Doors - Ballistic French Glass Doors
Zentry Advanced Security Solutions
Zentry Advanced Security Solutions
Burglarybuster 1 French Door Security Device for French Doors with one handle
Easy to install double security doors
Rosie's Three-Minute Tips: Securing Double French Doors
Zentry, Secure French Doors with Burglarybuster
Security Certified Doors Zentry Security Doors Residential Commercial Security Doors Ireland
Securing French Doors, Zentry Forced-Entry Solutions