The PBC-1321 includes a black colored PBC-UMS universal projector mount for projectors up to 40 lb. (18 kg) and an AST-1321 adjustable-height suspension adapter. The PBC-UMS offers flexible projector positioning with four patented dual-joint sup…port arms (US Patent number 7,942,375) that can reach almost any mounting point. The AST-1321 includes a 1.5 in. NPT coupler and allows the projector to extend from 13 – 21 in. (330 – 530 mm).Product Features:Universal projector mount with extension columnFour dual-joint support arms with Lock-Itª security leveling barrels for greater protectionGyrolockª quick installation connector