The Union 2234E 67mm Keyed to Differ 5 Lever BS3621 Insurance Rated Sashlock Polished Brass is one of the most widely-used locks for external doors. It is insurance company approved and has been tested to British Standard 3621:2004, making it one of the securest locks on the market today. For rebated double doors a rebate set is available to suit. It has a quality steel case (red enamelled) and solid brass latch & deadbolt, finished with polished brass finish.   Other Variations The lock is also available as a keyed alike lock, with an 80mm case size (57mm backset) a...