Since the mailboxes are generally placed centrally, such as the first floor lobby of a building. Therefore, the mutual opening rate of the letterbox locks (the probability of opening each other) is as small as possible.
The mutual opening rate of mailbox hooks commonly used in the industry is one hundred and twenty-one. This is enough for many residential buildings with low floors.
Plum ball lock
The plum blossom pin mail lock is much safer than the ordinary mail box lock, and its mutual opening rate can be as small as one thousandth to several tens of thousands.
The pinball lock structure is controlled by the arrangement of seven rows of copper marbles. According to the length of the marbles, the combination can be arranged, and tens of thousands of locks can be opened.
The magnetic marble letterbox lock is a new technology for letterbox locks with the following features:
1. Unique keyhole anti-blocking device, dustproof and foreign body blocked;
2. The anti-technical method is turned on, and the universal key is turned on;
3. The key cannot be copied by the individual, and it is not available on the market;
4. The keys between the locks are not open to each other, and the keys can be opened by a key;
5. Easy to install and low price;
6. Using rare earth high-energy permanent magnet material, it has small volume and strong magnetic force, and natural degaussing is less than one ten thousandth in a hundred years, with permanent and reliability.
