These replacement 510 Thread Magnetic Cap Adapter 3 Pack connect to the bottom of standard oil tanks to enable easy magnetic attachment to magnetic vaporizer. Rather than screw in your oil tank via a threaded connection, the 510 Thread Magnetic Cap Adapter 3 Pack allows you to simply snap the oil tank into the port of the vaporizer. The 510 Thread Magnetic Cap Adapter 3 Pack are constructed with high grade metal and a powerful neodymium magnet. These Magnetic Cap Extenders are intended for half ml cartridges.