The Heil RS-1 is a 12” riser mount designed for Heil booms. The RS-1 provides extra clearance for booms to extend up and over other audio equipment. The brass insert of the RS-1 ensures a smooth fit and noiseless boom movement for all Heil Sound boom arms. Other manufacturer stem sizes may not fit this mount. It can also be tightened to lock the boom in place. See Specs for installation requirements.