Designed to support larger condensing units, Hef-T-Bracket™ B3L features a cross bar that is attached to a wall, and 2 L-shaped brackets that are hooked and bolted into place on the cross bar. The condensing unit is mounted onto the L-shaped brackets, and fastened using the bolts and anti-vibration washers provided. Spirit Level included. Diversitech Hef-T-Bracket™ Large Mounting Bracket, Type 3, 21 in Length, For Use With: Mini Split Condenser, Wall Mount, Import