Features: Ensuring electrical connection with these 4mm banana plug and socket, featuring a secure snap design for testing. High conductivity metal cores and color insulation sleeves enable efficient current transfer while preventing accidental polarity mix in complex circuitry. Essential for electronics educators, engineering professional, and enthusiasts requiring standardized 4mm connector for test equipment or wiring solution. Optimized for academic experiments, sound system setups, and power supply integrations where banana plug connectors ensure uninterrupted signal transmission. Reinforced spring loaded contacts and flame retardant housing long durability across industrial workshop, maker space, and home electronics repair stations. Specifications: Component:Metal Size: Approx.38mm/1.49inch Color: Black/Red Package Includes: 5 Set Banana Plug note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.