Key padlock recommended series: plastic case rainproof padlock series, pure copper padlock series
 
Recommended models for combination padlocks: DA40/50, TSA-2001/3
 
In 1930, Shun Kee lock factory was founded, which is China's first lock factory, but also the predecessor of the three-ring lock industry, in the early days, the founder Liu Jichen developed China's earliest "Samsung" brand marble copper lock, and then gradually introduced to the market blade iron padlock, double padlock and other innovative products. In 1957, Sanhuan was sold overseas for the first time, and the export volume of copper padlocks reached 44,000.
 
In China's padlock industry, Sanhuan's leadership position is unquestionable, with its thick padlocks and strong protection capabilities, and its product range is small but enough to cover all aspects of daily needs, such as pure copper padlocks suitable for indoor daily use, iron padlock series, and molded weatherproof padlocks and stainless steel padlocks designed for outdoor wind and rain environments. If necessary, you can also choose the double-open key lock of the three rings, both keys must be used when unlocking, and the anti-pry ability is higher than the general padlock, which is also the highest price padlock of the three rings, which is 95 yuan.
 
Pure copper padlock can be divided into two designs: straight lock and horizontal lock, horizontal lock for the "general does not get off the horse" type blade lock, that is, the padlock can not pull out the key in the open state, only after the lock can the key be taken out of the lock cylinder, that is, the so-called "general does not get off the horse", this lock cylinder design is suitable for users who often forget to pull out the key and are more careless. However, the horizontal unlocking specifications of the third ring are smaller, which is more suitable for locking drawers, lockers, etc., and the price is less than 20 yuan.
 
In addition, the three rings are still selling the most traditional iron padlocks, and it is also its most affordable padlock product, the cheapest mini padlock is 4.5 yuan, and the padlock with the largest specifications and a lock beam diameter of 12mm is only 28 yuan, but the iron padlock is easy to rust, and the smoothness of unlocking will be greatly reduced after rusting, which is only suitable for indoor environments.
 
The lock body and lock beam of the molded weatherproof padlock series are made of mille-feuille steel, wrapped with a plastic shell, and have a keyhole protective cover to prevent water from entering the lock cylinder, this padlock design can also avoid rust and corrosion of the lock body in the long-term wind and rain environment while maintaining a certain hardness and strength of the whole, and the price is more affordable than that of stainless steel padlocks.
 
There are fewer choices of three-ring combination locks, and there is only one TSA customs lock, and the price is about 20 yuan. Judging from the specifications, its combination lock is only suitable for gym storage, dormitory drawers and other small places, C09 series copper lock body shape is more traditional and old-fashioned, consumers who prefer simple design can choose DA40/50, the fully open roller password turntable is easier to operate, and the price of about 20 yuan is also quite advantageous compared with similar modeling products of Master.