The Shure HPAQA1 Threaded ¼" Adapter attaches securely to the 3.5mm stereo mini-plug connector on the cable included with SRH240, SRH440, SRH840, and SRH750DJ Professional Headphones. Read More...'

Shure HPAQA1 Locking 1/4" Adapter for SRH240/440/840 Headphones