A2 V2A stainless steel: The hexagon socket head cap screw is made of A2 V2A stainless steel, which is rust and corrosion resistant and can be used outdoors or in damp environments. The surface treatment of the screws is oxidation blackening rather than electroplating black zinc plating, which is not easy to fade and scratch resistant, and is more compatible with some black equipment. Unique design: The outer edge of the head of the hexagonal plate of the head screw is round, the middle has a concave hexagonal shape, and the edge of the head is chamfered, so that the bolts are not easy to scratch or damage the surrounding parts during assembly, and to maintain the finish and aesthetics of the parts. High safety: The hexagonal design can transmit the torque evenly, effectively preventing the bolt from slipping and falling off during use, especially in a large vibration or heavy load environment, its tightness and safety are far superior to traditional screws, so as to protect the safety