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Usually, it is difficult to find the hole of the lock in night or darkness for the keyhole is too small to find out. Guiding lock is designed to solve this problem. When touching the edge of the lock, the key could easily go inside into the keyhole according to the direction of groove. Even there is only some dim light, grooves could reflect the light to help people find the location of keyhole, so that it is convenience to unlock the door in night.