Areyourshop 10 Pcs 5 Color Nickel Plated Banana Plug For Probes Binding Post Banana plug diameter: 4 mm 4MM Banana Plug FOR BINDING POST Speaker Meter Test length:about 55mm; The side hole diameter:4mm. Package Included: 10pcs (2 Red + 2 Yellow + 2 Black + 2 Blue + 2 Green) 100% Brand New and high quality