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The new MTC-30UB(-WH) optional U-Bracket accessory is designed for use with the JBL Professional Control 30. The U-Bracket allows installation of the enclosure to flat sturdy surfaces when the included InvisiBall Mounting Structure is not appropriate. The MTC-30UB is constructed of 11 Gauge Steel (0.12 in. thick), and is finished in Polyester Based, Black or White (-WH) Powder Coating.