Standard 5.5 × 2.1 mm mainstream DC size, widely applicable to monitors, routers, CCTV cameras, LED strips, external hard drives and notebook auxiliary power interfaces.; Complete set includes male plugs and female jack adapters, supports DIY soldering for custom power cords, cable repair and extension transformation.; High-conductivity copper contacts reduce contact resistance, stable power transmission with no intermittent power cut during long-time operation.; Insulated plastic housing features anti-break structure, effective isolation to prevent short circuits and electric leakage for safe assembly.; 10-piece bulk package meets mass wiring maintenance, electronic project DIY and equipment batch repair demands, high cost performance.