The flat dies of our works are made of alloy tool stell(Cr12MoV),adopt advance technique of vacuum heat treatment,which can process high accuracy and high strengh fasteners.That lower flat die in 9SiCr can process common fasteners.Process and rub the silk board with the hands specially according to the needs of user. Make the straight line wove of 0.5-1.5mm and rub the silk board with the hands.
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