Dead latches universal latch triple option. Triple option deadlatch, square corner, radius corner, drive-in latch, fits 2-3/8 inch or 2-3/4 inch backset, for f series exterior locksets, visual pack. For exterior doors. Replaces 3 different latches. Faceplate options square and round corners or circular drivein. Circular drivein option requires 1 inch bore, standard. Fits 23/8 inch or 23/4 inch back sets housing diameter 7/8 inch.