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Design explanation： In daily life ,we often encounter the experience that the screw slips to prick our hands accidentally when we tighten them. It seems like a minor problem ,but it does bring inconvenience to our lives. If the shape of the screws is smooth ,lovely and pleasant ,you will feel more comfortable when facing them.The screw is intended for the family who uses a screwdriver of the crowed .It can make them fixed the screws more easily and prevent pricking hands.