These child safety locks that prevent the door from being opened at all are available for door knobs and door handles. The child safety lock for door handles is U-shaped and made of plastic. This comes with a connector lock. One side of the U shaped child safety lock is loped through the handle. The plastic lock itself is connected to both the ends of the U. This needs to be pulled till the lock is tight. An adult needs to use force on both sides of the lock to be able to open the lock. This is something that is not tough for an adult. However it is almost impossible for a child to accomplish. The cabinet child safety locks that are available are also U shaped in nature. These are made of more flexible plastic and can tighten completely to allow for complete closure of the cabinet. Locking these is easy. However, it needs two hands pushing at the knob simultaneously for the lock to open.