Incorporating both a latchbolt and a separate hacksaw resistant deadbolt the 4L70 is suitable for use on inward opening doors and has a backset of 50mm. The deadbolt can be locked into two positions by the internal or external cylinder using the key. With the added security of a 6 pin anti-torque cylinder to help prevent wrench attack, the sturdy overall construction of the lock is designed to offer resistance to force, whilst the double deadlocking bolt ensures that entry cannot be gained by anyone breaking the glass and releasing the latch handle.