Audio-Technica AT8491D Spring-Loaded Drum Mount Microphone ClampThe Audio Technica AT8491D is a drum mount designed to attach a gooseneck equipped Audio Technica ATM350a condenser microphone (available separately) to a drum's tension rod without obstructing access to tension adjustments. The spring loaded mount provides shock resistance to reduce the transfer of vibration between the drum and the mic. The AT8491D's socket incorporates a locking screw that allows it to securely hold an AT8490 5" or AT8490L 9"