Question: are all banana plugs the same?
Answer: 1 - General Information on Banana Test Plugs Most banana plugs are commonly found with either a 4mm or 2mm plug to be able to plug into a 4mm or 2mm sized banana socket or jack. You can view our quick guide to banana sockets here. They can also be found in 1mm variants and often known as 'pin plugs' when of this size.