Marks 68F/3 Polished Brass Finish US3 Double Cylinder Solid Jimmy Proof Deadbolt Lock Set With Flat Strike And Schlage SC1 Keyway, specially designed as a commercial grade locksmith quality lock set. The shutter guard provides extra security, prohibiting tampering with the lock if the outer cylinder is compromised. The solid body, is extra tough and durable, providing the perfect security, keeping the door locked, safe, and secure. The box includes a jimmy proof Lock, a rim cylinder with a flat tail piece and a recessed cylinder collar, a flat strike, and 2 Keys with Schlage SC1 Keyway, mounting screws, and a mounting plate.