Features BRASS CORE: This adapter adopts brass as its core to make sure the good contact, strong conductivity, anti aging, and long service life. ALLOY STEEL MATERIAL: We use thick and safe alloy steel as the shell material of the connector, ensuring high temperature resistance, firm connection. FINE WORKMANSHIP: With exquisite appearance and excellent texture, this adapter kit provide an excellent use experience. Ideal gift for coworkers. STANDARD SIZE: Well crafted in standard size, these adapters ensure a tight fit, choose with confidence! 12PCS: There are 12 pieces adapters in the package that can be used for a long term or make replacements. Specification: Item Type: Threaded Magnetic Adapter Material: Alloy Steel, Brass  Package List:12 x Adapter  Package List 12 x Adapter