B connectors are used for splicing copper wire in order to continue an electrical connection. Cablesupply only carries the best in these products so order your adapters and connectors here. Sometimes they are called Bean connectors. It really depends who you are talking to. Some people even call these Jelly Bean Connectors. These are used for tapping and splicing telephone wires. These are meant to be used to splice phone cable, not network cable like Cat5E or Cat6. The connections are called IDC connections. IDC stands for Insulation Displacement Connection. This type of connection allows you to create a gas tight seal. This helps you avoid any kind of corrosion.