Common pin tumbler cylinders may be compromised by picking, drilling or key bumping. For applications where a greater security level is required, we suggest using pick/drill resistant cylinders with multiple pin planes such as those with side-bars. Marks USA HI-SECURITY™ Cylinders are constructed with sidebars and are drill, pick and bump resistant.

• Marks single cylinder deadbolt lock. Locked or unlocked by key from outside or thumb turn inside. Grade 2 auxiliary lock, UL listed for 3-hour fire door.
• Adjustable backset for 2 3/8" or 2 3/4".
• For doors 1 3/8" to 1 3/4".
• Comes with the 2 Marks high security key.
• This deadbolts feature an exclusive patented steel strike reinforcer with 76mm heavy gauge screws that penetrate through the door jamb and right into the wall stud. Add to that a full 25mm-throw deadbolt and you have an excellent deterrent to kick-in attacks.
• The deadbolt further features a hardened steel roller to prevent cutting and sawing attacks.
• This deadbolt base is Schlage B560 series deadbolt.
• Bright brass finish.
• This deadbolts provide high quality auxiliary and primary locking for residential and commercial applications