Knowledgebase : Other > Common Lock Terms
These numbers and letter combinations represent lock/hardware finish codes - see table below. LIST OF FINISH CODES/SYMBOLS U.S. BHMA Baldwin Description 9 611 n/a Bright Bronze 10 612 100 Satin Bronze 10B ...
The backset is the distance measured from the edge of a door to the center of the cross bore. The deadlatch, or latch is what the arrow points to in the above image.
The hole drilled through the door - most commercial and residential locksets use a 2 1/8" Diameter, but not always - check your installation templates.