In a writing tool made to push the core out little by little by turning or pressing the tip of the shaft into a thin core, a long bucket with a lid that can be opened and closed includes a device that rotates freely using a rod as a rotating shaft. You don't need to carry it with you, you only need to have the sharps, and if you carry only the sharp shims that fit your sharp, you don't have to separate the sharp shims separately. As the sharp shims are turned up and down, you can use the sharps or sharp shims. It has the advantage of being convenient when you need to take it out.
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