1/4-inch threaded adapter for SRH240, SRH240A, SRH440, SRH750DJ, SRH840 and SRH940 professional headphones. - HPAQA1
Locking 1/4" Adapter for SRH240A, SRH440, SRH550DJ, SRH840, SRH940, SRH1440, SRH1840