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About this item ✅Material: Carbon Steel Copper PlatedWelding Stud Screw. ✅Feature: Inside Thread,copper plated welding studs machinery screws with soldered dot. ✅Feature：The thread is clear, the surface is smooth, the thread is sharp, the force is uniform, and it is not easy to slip during the rotation process.After the surface to be bonded is melted, the pressure is quickly released to complete the welding, which is fast, reliable and simple. ✅Widely used in bridges, highways, housing construction, shipbuilding, automobiles, power plants, electrical control cabinets and other industries. ✅If you have any questions about the product, please feel free to contact us, and we will do our best to help you. No Description