The PBC-2446 includes the PBC-UMS universal projector mount for projectors up to 40 lb. (18 kg) and an AST-2446 adjustable-height suspension adapter. The PBC-UMS offers flexible projector positioning with four patented dual-joint support arms (U…S Patent number 7,942,375) that can reach almost any mounting point on a projector. The AST-2446 includes a 1.5 in. NPT coupler and allows the projector to extend from 24 – 46 in. (610 – 1170 mm).Product Features:Universal projector mount with large extension columnFour dual-joint support arms with Lock-It┬¬ security leveling barrels for greater protectionGyrolock┬¬ quick installation connector