Duoling is a sub-brand of EMARKS Group, a well-known international commercial hardware brand in the United States, and is also the only member of the DHI Door and Window Hardware Association in China's door lock industry, which has made a breakthrough in the Chinese market to apply the durability and life indicators of commercial hardware to civil hardware, and put forward a 10-year warranty commitment.

As the first door lock brand to introduce the real American Standard door lock into the Chinese hardware market, Doling has been favored by the world's top hotel groups, and star hotel brands such as Hilton, Sheraton, Shangri-La, and Marriott have implemented the overall hardware solutions provided by Doling. The biggest feature of the Duoling door lock is that it is full of materials and durable, the thickness of the lock body plate is more than 1 mm, and it has a strong anti-extrusion and impact resistance.

Zinc alloy is the most common door lock material on the market, easy to cast, easy to process, low development cost, but compared with stainless steel and brass, zinc alloy has low strength, poor impact resistance, poor rust resistance, internal material is prone to oxidation, brittle and loose and easy to break, poor fire function, low temperature resistance, is the worst safety performance of the material.

The manufacturing process of stainless steel and brass is more complex, but the corrosion resistance is strong, and the anti-drilling, anti-prying, and anti-impact capabilities are also better, and the price is more than double that of zinc alloy, which will only be used in mid-to-high-end products.

From the product point of view, Duoling's main product is the interior handle door, in addition to the appearance style, there is not much difference between different models of the same material. According to the material used, it can be divided into three categories: zinc alloy, stainless steel and pure copper, and the prices are 149 yuan, 199 yuan and 399 yuan respectively. Among them, Dojacob, Baroque and Frieda are made of zinc alloy, Jamie and Emma are stainless steel, and Mitchell and Clooney are pure copper.

Dolin Mitchell is a high-end model in the Dolin indoor door lock series, from the panel material, handle material to the lock cylinder material, the use of more expensive, difficult to process copper, to ensure the texture and firmness of the lock body. In terms of deadbolts, Mitchell uses a more robust double deadbolt solution, and the diagonal and square tongues are made of high-grade 304 stainless steel. The shape of the lock body is more modern and simple, the handle is full of design, the streamlined handle is simple and elegant, and the gold-plated exterior is very suitable for use with the warm color decoration style.

Dorlingclooney is very similar to Dorling-Mitchell in that they are both made of pure copper, but the difference is in the exterior style. Mitchell walks in a modern and simple style, while Clooney takes a European classical style, with a deeper and calmer color scheme, and a brushed texture similar to wood grain is used on the panel, which is very similar to the European decoration style.

Duoling belongs to the more common foreign door lock brand in China, the store is stationed in most of the building materials market, and there are flagship stores in Jingdong and Tmall, which is more convenient to buy.