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Lost your keys to the postbox or can't find them then do not worry as the best and cost effective DIY solution is to change the lock and it comes with 2 new keys to protect the security of your mail Easy to change the lock just need to undo the small nut on the end of the barrel as pictured then undo the larger washer nut on the barrel, this will loosen the lock so it can be removed then just put new one on and redo the nuts in order. You will need a pliers or other tool to tighten/loosen and if this is not possible then you can loosen the bar from the inside to help the door open to enable the change over process. Save the cost of buying a new postbox as it is unnecessary waste Fits most outdoor post boxes with a flush door fitting Length of threaded barrel 19.5mm Diameter 16mm