A binding post is a connector commonly used on electronic test equipment to terminate (attach) a single wire or test lead. Binding Posts are also found on loudspeakers and audio amplifiers as well as other electrical equipment.
This is a binding post with 10 mm outer diameter. Available in pairs of red and black. (OD is about 12mm at the ribbed head)
Banana plug, consisting of a cylindrical metal pin about 20 mm long, with a diameter of 4 mm, which can be inserted into a matching 4 mm socket to make an electrical contact. The pin has one or more lengthwise springs that bulge outwards slightly. These press against the sides of the socket, improving the electrical contact and preventing the pin from falling out. The back end of the banana plug is a color coded plastic insulator that may be red or black.
Long Banana Jack is a panel-mount socket for 4mm banana plugs with up to 20 mm (1 inch) long pin. Can be mounted on metal surfaces with up to 2 mm, and plastic or wood surfaces with up to 5 mm thickness. It mounts on a 8mm hole. The overall length is 25 mm.
PBC9V is a battery connector for 9-volt batteries. This battery connector has a pair of red and black lead wires that are stripped and tinned 5 mm on the ends. The connector back is covered with black vinyl for additional protection and safety.
Short banana jack is a panel-mount socket for 4mm banana plugs with any length. Can be mounted on metal surfaces with up to 1 mm, and plastic or wood surfaces with up to 4 mm thickness. It mounts on a 8mm hole. The overall length is 13 mm. The face outer diameter is 11 mm.