Zhongyuan Metal Products Co., Ltd. of Dongguan City, specializes in the production of wind batch sleeve (plain sleeve nickel drilling screws, including the hit 5000 or more, gray chrome steel drilling screws sleeve, including the hit 20,000), Cross , word for word, the word rice, plum blossom, square, hexagonal, 40 Cr, S2, SK2 bronze head and blasting wind approved the first batch of wind, positioning the first batch of drilling, tapping head, microcomputer m screws, shaped metal parts, laser level