1, the dead bolt lock: a single tongue outside door lock, is one of the most simple economic door lock, used for outside door. Mount, outdoor open with a key, indoor use of hand open it. Insurance institutions indoors can lock tongue. Make outdoor cannot open with a key, or lock lock tongue back people internal fixation, make the door without the key can open and close freely.
2, double tongue billiard locks: also known as a double tongue outside the door. Indoor use of hand, outdoor open with a key, can also be the key reversal outdoor, make a second lock tongue out and fixed. Indoor insurance institutions lock the second lock tongue is also available. Some also can connect with chains, to prevent the door is opened entirely.
3, wind touch bead lock: can be used for interior door or just wind does not need to lock on the door. Lock the touch beads, as long as the push or sliding door can be opened.
4, pad locks: this kind of applicable to push on the door lock, lock tongue for crab clip-on or hook, indoor and outdoor after the lock must be flat keys can be opened.