Stanley Commercial Hardware Commercial Single Cylinder SFIC Auxiliary Deadbolt from the QDB200 Collection, 6-Pin, Satin Chrome Finish (Pack of 1) Tested to significantly exceed the 150,000 cycles required to meet Grade 2 certification. Full 1" (25.4mm) Throwbolt with saw resistant hardened steel roller pin. 2.75" Deadbolt Latch Square- 1.125" Face Standard Deadbolt Strike UL Listed