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Locks For Doors and Flaps This keyless hookbolt deadlock increases the lock strength and security of sliding narrow stile aluminium storefront doors. Its small size makes it easy to install, and the manufacturer offers a lifetime guarantee on mechanical security. You will need to measure the'stile ' of your door before installing a hook-bolt lock. This is the distance from the edge of the door to the start of any panels, glass or embedded decoration. Hook-type latches, which have a hook and bracket The locks on flaps and doors must be strong enough