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When driving a screw, it usually has no any hints to show you how to operate it. While most of the screws are locked clockwise, there still have some screws have to be locked counterclockwise. A more severe case is that when you unlock a screw in the wrong way, the driving ditch of the screw head might collapse. Without changing the main design of screws, make users understand the operating procedure more easily.
Taichung City, Taiwan