Everest D sections/keyways are restricted.

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It is not possible to key SFIC and standard cylinders including Schlage FSIC into the same system.  A keyway name may be shared between the two key fami...
A PO from a distributor with a letter of authorization from the end user.
Schlage Everest B keyways are restricted SFIC keyways.
Split key systems are delivered in the highest level section on the key tip (insert): L - obverse or classic Y - reverse 0000 - Paracentric ZZZZ - Quad D000 - restricted Everest C000 - open...
Schlage Everest 29 is a new keyway family that launched in August 2012 and is patented until 2029. It offers the highest level of restricted key system security by Schlage through patent protection...
All of the Everest D sections/keyways are restricted.