Helicopter Helmet Round Mount / Boom Support / Boom Guide Ratchet (Knurl Knob)

<span style="font-size: 12pt;">This helicopter helmet Round Mount, also referred to as a "Knurl knob", is used to attach wire or the flex boom to a series of Helicopter Helmets. Will fit all helmets.<br><br>This is a universal part that will fit any flat to concave surface for the attachment of a microphone boom. Headsets included.<br></span>