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Someone may face the following problem. When one wants to decorate his room with some pictures or photos hanging on the wall, always cozy and elegant within imagination, the reality is in contrast disappointing. Because of the lack of horizontal line, nails are always crooked.
This hammer is designed to solve this problem. There is an auxiliary tool inside the handle which can be extracted when using. Then open the infrared light before knocking in the second nail and make it vertical. Then the second nail is knocked in horizontally comparing with the first one.