21010000010 CONN. MICRO JACK ACCES.LOCKNUT M16 21010000010 is a premium microphone jack accessory that featuring a Locknut type made of Metal material. Designed in M16 shell size, available in Silver color. Manufactured by HARTING in the Han® M12 series. Compliant with ROHS standards and available in BULK packaging. Perfect for enhancing connectivity and durability in professional audio systems.