Three-roller gates are also called three-bar gates, three-stick gates, three-roll gates, roller gates, and roll gates. The barrier (gate bar) consists of three metal bars forming a spatial triangle, generally using a hollow closed stainless steel tube, which is strong and not easily deformed, and achieves blocking and passage through rotation. From the core control method, it is divided into mechanical, semi-automatic, and fully automatic types. From the form, it is divided into vertical and bridge types. Vertical three-roller gates are smaller and easier to install; bridge-type three-roller gates have longer channels and higher security. Advantages of three-roller gates: They can very effectively achieve single-person passage at a time, that is, only one person can pass at a time, and the safety and reliability are relatively high. The cost is relatively low. They have strong waterproof and dustproof capabilities, strong environmental adaptability, and are suitable for both outdoor and indoor use. Suitable for ordinary pedestrians and occasions where the pedestrian flow is not large or pedestrians do not take good care of the equipment, as well as some harsh outdoor environments.

A security inspection device specifically designed for important locations such as logistics, customs, airports, stations, prisons, ports, and warehouses. Suitable for inspecting large items, luggage, parcels, and packages. It uses a multi-energy detector and a digital image processing system comparable to the world's top products, easily handling security checks for goods weighing over 2 tons. The inspection images are high-definition, and the performance is stable and reliable.

Nightclubs and bars are good places to relax and unwind after work, but because the main consumer group is young people, and they may drink too much alcohol, physical contact is inevitable while dancing, and violent and bloody incidents often occur, bringing potential threats to the lives and property of other consumers and extremely negative impacts on operators. The "Regulations on the Management of Entertainment Venues," issued by the State Council Order No. 458 signed by Wen Jiabao, Premier of the State Council of China, officially came into effect on March 1, 2006. According to the regulations, commercial discos, bars, and other entertainment venues will be equipped with security inspection equipment to conduct security checks on people coming and going, thus avoiding similar incidents, and entertainment venue operators will also have laws to follow.

To ensure flight safety, security checks are an important part of every passenger's journey on a civil aviation passenger aircraft. This process is undoubtedly familiar to passengers—before entering the airport's restricted area, luggage must pass through security scanners, and passengers must pass through security gates before undergoing a more thorough check by security personnel with handheld scanners.

Turnstiles, also known as revolving gates, evolved from three-roller gates and borrow features from revolving doors (the difference being that the barrier is not a glass door, but a metal fence). According to the height of the barrier, they are divided into full-height turnstiles (also known as full-height gates or full-height revolving gates) and half-height turnstiles (also known as half-height revolving gates), with full-height turnstiles being more commonly used.