SECTIONAL VS ESCUTCHEON

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Typically for a 1-3/4" door you would use a 1-1/4" cylinder.  Use the Table in the Pricebook for a reference:  
See image, ANSI A115.1 Mortise Lock Prep   This door prep requires the N escutcheon with the L283-029 spacer kit to keep the springcage from falling into the door.&nbs...
 Mounting Posts   Part Number  Door Thickness  L583-211  1 3/8"  L583-212  1 3/4" - See note section on SL1 trim  L583-213  2...