QUOTE(aarondotcom @ Feb 14 2012, 05:44 PM)
sorry, can u explain more, how to nullified? I going to get a security door. which the contractor told me it is very secure, got 1 set for contractor and another set for home owner. But my doubt are, for contractor and for house owner not the same set? but accessing the same door lock?
There is this type of lock, when contractor key is use first. Than when normal key is use, the contractor key will be void. This is just a generalized summary. More detail you need to ask the door seller.Another method that I use is digital lock and numbered pad lock. I just give them the access number, then they done change it.
Feb 14 2012, 06:41 PM

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