Why are there two different bore sizes on the templates for the B500 and B600 deadbolts?

The bore size is dependent on the function of the deadbolt.  Some functions can be installed into a 1 1/2" or 2 1/8" bore while others require 1 1/2" only.  You need to reference the deadbolt installation sheets and door template guide to determine what door preparation is available for your application.

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