This Plantronics Quick Disconnect (QD) Lock Kit is designed to fit onto all of Plantronics H series and Plantronics P series headsets with any of the Plantronics Quick Disconnect designs. The new lock uses the slots in the Quick Disconnect halves to form a strong, tamper-proof lock. The lock attaches around the quick disconnect making it very difficult to remove the headset cable from the amplifier coiled cable. part# 62976-01