Some homes come equipped with this lock. It offers very little protection since the bolt can be slipped with a credit card or knife.
This same lock, with a deadbolt latch, provides more protection, but it too can be forced open.
A deadbolt lock can provide good protection. When you turn the key, the lock mechanism slides a strong metal bolt from the door into the frame. When you buy a deadbolt lock, make sure that the bolt extends at least one inch from the edge of the door, the connecting screws that hold the lock together are on the inside of the door, the strike plate is attached to the door frame with screws that measure at least three inches in length and that the cylinder has a steel guard around the key section. The cylinder guard should be tapered or rotate freely around the key section to prevent wrenching if it is twisted.
Single Cylinder Deadbolt
A solid bolt, activated by a key from the outside or a knob on the inside, slides into the doorframe. The lock cannot be slipped or easily pried. Deadbolt locks are only as good as the door and frame they are installed in.
Double Cylinder Deadbolt
This lock is basically the same as the single cylinder deadbolt, except that it requires a key to be used from either side to function.
This lock has either horizontal or vertical deadbolts. It cannot be easily slipped, pried or forced with a wrench. This lock, like all others, requires a strong mounting surface and hardware to be effective.
When selecting padlocks to secure your garage door, storage shed, fence gate or toolbox, do not economize. Low-priced locks are made from low quality materials and easily pried open or cut with bolt cutters. Look for these features when purchasing a padlock:
Double locking shackle at the toe and heel
Hardened steel shackle, the larger the diameter the better
Five pin tumbler
Key retaining feature (prevents removal of the key when unlocked)