The Lockwood Symmetry Cavity Sliding Door Entrance Set fits external or perimeter cavity sliding doors that need key locking, with a flush profile that recesses fully into the door cavity. A retractable door pull stays flush when not in use and pulls out for operation. Key locks and unlocks from outside, with a turn-plate inside. Tested to AS4145.2-2008 with over 30,000 turn cycles at 3kN pull force. Fits standard 54mm door preparation with 60mm backset, suits 32-40mm door thickness (a spacer is included for 32mm doors). Finished in Matt Black.Features:- Designed in Australia for specific Australian market conditions- Easily fitted into a standard 54mm door preparation with a 60mm backset- Fitted flush against the panel of the sliding door for full recess into the door cavityBacked by Lockwood, an Australian brand with over 90 years of locksmithing experience.