Direct factory supply of environmentally friendly copper spot welding screws and碰焊 screws in stainless steel or carbon steel: SUS welding screws M3*L, SUS welding screws M4*L, SUS welding screws M5*L, SUS welding screws M6*L, aluminum welding screws M3*L, aluminum welding screws M4*L, aluminum welding screws M5*L, aluminum welding screws M6*L, electroplated copper welding screws M3*L, electroplated copper welding screws M4*L, electroplated copper welding screws M5*L, electroplated copper welding screws M6*L, and other specifications. Shenzhen Hengbo Precision Five