bout this item RIELDA Re-programmable locks enables the Owner/Manager to change the key being in use with one completely different without having to replace the locks. It is possible to Re-Program the locks as many times as is necessary with 1.048.000 different key combinations. Just a half turn of the Programming Key to change the lock combination and cancel the previous key. No lock dismount is necessary. Easy to disable lost, stolen, key non returned, key duplicated without your permission or keys end up in wrong hand. Re-programmable locks are particularly suitable for the type of organisation where employees are entrusted with keys for limited access and where temporary personnel are granted access for a limited period. Why change the locks when you only change the key?