InFocus Corporation Ceiling Installation Plate for Projector Mount Use all 4 holes or 2 opposing holes The 4" x 4" mounting pattern allows use of 0.38" mounting bolts 1.5" NPT threaded opening Weight capacity: 500 lbs. Black finish Use all 4 holes or 2 opposing holes The 4&#034; x 4&#034; mounting pattern allows use of 0.38&#034; mounting bolts 1.5&#034; NPT threaded opening Weight capacity: 500 lbs. Black finish