{Major ADVISED Series (UL Listed -Di ill & tap for (6) 1147-208 x 3141 machine screws (4D 2¢E) for latches. (Bier PERVADES (Fire Rated -0l 932" holes (4D 2xE) inside and 318" holes (4xD 2xE) outside for the (Bi thru bolts | Note: When installing top latch unit 1. Dill(1) E hole and install screw but do nol tighten all the way, 2. Dell (27 D holes and install and frighten screws. 3. Lighten screw n hole E all the way.