Sanhuan is the oldest lock manufacturer in China, and it is also the only "China time-honored brand" lock enterprise, its predecessor Shunji Lock Factory, founded in 1930, is the first lock factory in China. As one of the main drafting units of the industry standard GA/T 73-2015 "Mechanical Anti-theft Lock", the brand strength of Sanhuan should not be underestimated.

Shandong Province is one of the important hardware product manufacturing bases and sales centers in China, and the advantages of the three rings combined with the region are developing rapidly. And as a typical northern lock manufacturer, Sanhuan mainly produces padlocks and various vehicle locks, which are different from all kinds of door locks from southern manufacturers. In 2017, Sanhuan Auto Lock Lock reached 20% of the national market share, and also joined GM's global GEM project.

Compared with the field of car locks, in terms of indoor door locks, the performance of the three rings is relatively average, most of them are made of zinc alloy, and a small number of models are made of stainless steel and pure copper, and the price is comparable to that of the same type of products such as famous doors and Guli.

G26 is a three-ring less split pure copper door lock, the lock cylinder adopts a number of anti-theft technologies, beads anti-toggle punition design, there are wolf tooth anti-pry parts in the hole, which can prevent violent opening tools from inserting into the keyhole, the safety factor is higher than most indoor door locks, and the price is 519 yuan.

Users who like Chinese style can choose M230, its panel and handle have Chinese characteristics of auspicious cloud patterns, the overall color is golden yellow, and the Chinese style decoration style is very matched, the price is 169 yuan.

As one of the most well-known hardware companies in China, Sanhuan has stores all over the country, so there is no need to worry about purchase channels. In terms of after-sales, it supports a one-year warranty, a ten-year warranty, and provides free maintenance or free replacement for non-human failures of the mechanical part during the warranty period, and the after-sales service is guaranteed.