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People usually get trouble with putting the key right into the keyhole. "v" lock will help you to solve this problem .
The feature of "V" lock is that its keyhole is at the bottom of a cone-shaped socket. And when opening the door, people can put the key into the keyhole conveniently along the cone-shaped structure.
Wei Lin, Shaodong Jiang, Yanfei Tian, Fang Song,