The Heil FL-2 is a flange mount designed for Heil booms that mounts to the top of a desk or table. The FL-2 features a security lock allowing for booms to be tightened to the exact position desired. The brass insert of the FL-2 ensures a smooth fit and noiseless boom movement for all Heil Sound boom arms. Other manufacturer stem sizes may not fit this mount. See Specs for installation requirements.