The original screwdriver pen is a handy tool that I use as a product design student in my day-to-day life. 

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The redesign for the existing screwdriver pen was simple; remove the hollow triangular indents and add a rubberized grip to the handle to allow for easier usage when my hands get greasy or wet. Often, the inner workings of products are greasy, and this redesign helps to ensure my hand doesn't slip when taking things apart.