The 122505A is a black, do-it-yourself retractable sheath banana plug used for creating custom-length patch cords. It is rated for 20 Amperes and an operating voltage of 1500 VRMS (CAT III), with an operating temperature range of -10°C to +80°C. The plug accepts 18 to 22 AWG wire and features contacts made of nickel-plated brass and beryllium copper. Its spring-loaded retractable sheath allows for versatile use in both sheathed and non-sheathed style banana jacks, making it ideal for custom test and measurement setups.