Yongnian Xinlan Fastener Co., Ltd. is not only a supplier of drilling screws, but also produces internal expansion bolts, GB bolts, hexagon bolts, special bolts, 35CrMoA nuts, 8 nuts, 10 nuts, 45# nuts, GB nuts. , special-shaped nuts, flange nuts, square nuts, hot-dip galvanized standard parts, rigging, engineering machinery parts and other products.