The KROM-25DB51C19 is a UL/cUL listed and UL 10C 3 hour fire rated, grade 2, matte black (C19), single (51), deadbolt for door thickness of 1-3/8" to 1-3/4". It has a schlage keyway, and a standard backset of 2-3/4". It has a precision solid brass pin tumbler cylinder, and it comes with 2 nickel plated brass keys. The latch front is 1-1/8" x 2-1/4" square and the latch bolt has a solid brass 1" throw with hardened steel pin inserted. 5 year mechanical warranty.