Triangle Self Tapping Screws are commonly used in thin sheet iron, casting and hard plastic of the connection, triangle Self Tapping Screws have a unique triangular cross-section contour and the approximate positioning of the chamfer to the front, it is similar to the tapping by the tap, are connectors no end of thread to automatically scored, and provide better anti-loosening and anti-shock effect, replacing the traditional use of machine screws and dental composite shells, mounting pad, reducing assembly time, reducing the direct costs, and provide a better connection effect.