G-U Ferco Middle Extension with Roller Pin for doors greater than 81 inches -
Faceplate: 5/8 inch (16mm) - Ferguard Silver
Extension Length: 19-5/8 inches (500mm)
Maximum Cutoff: 10 inches ( 250mm)

Note: If door is over 101 inches, it will require two Extensions.
Basic Gear 1900mm + top shootbolt 160mm = 2060mm = 81.10 inches
Extension 500mm + 2060mm standard = 2560mm = 100.787 inches