40pcs Nickel Plated 4mm Multimeter Probe Banana Plug Male Screw Type Connectors Material:ABS,Nickel Plated Easy fit for wire size up to 4mm,Great tools for using in the audio equipment. Color coded plastic insulation jacket, for easier recognition Screw connector fitting, secure the wire in the adapter without the need of soldering. 20pairs in one package(20 x red and 20 x black)