One-piece copper screw, gold-plated copper cap, gold-plated iron gasket, solder nut, bright electroplating, good contact performance, and good insertion and extraction force. Take one piece = 4 pieces, the color is red and black, and the package price is 10.68 yuan. There is a dimensional drawing inside. (Except for Hong Kong, Macao, Taiwan, Gansu, Xinjiang, Tibet, Inner Mongolia Autonomous Region, and marginal areas, free shipping in other places.)