General locks, China's well-known trademark, the main bicycle locks, is the largest bicycle lock production and sales enterprise in China, has won the "national inspection-free products", "national spark plan project implementation unit", "national torch plan project implementation unit" and other honors of recognition. The universal door lock adopts the European standard safety lock cylinder and the German tooth flower technology, and the mutual opening rate is 1/100,000, which is much higher than the national B-level lock standard. As a bicycle lock manufacturer, GM mainly targets the low-end market in terms of door locks, and consumers who do not have special needs for door locks can consider it.