The bicycle chain lock body is made of aluminum alloy, which is cylindrical, with a diameter of about 25 mm and a length of about 5 cm. The lock core is made of copper and installed in the central part of the lock body. This lock is connected to an iron chain with a thickness of about 6 mm at one end of the plane of the lock body. The whole iron chain is wrapped by plastic hose, and the length of the chain is about one foot eight inches. The other end of the chain is connected with a steel lock stud head. There is a circular groove around the lock cylinder head. There is a round hole on the plane at the other end of the lock body, that is, the lock column hole, which just fits the lock column head. There is a lock pin connected with the lock core in the round hole.

The bicycle lock plays the role of anti-theft bicycle. There are bicycle locks with different functions in the market. At the beginning of the reform and opening up, many people called for strengthening the safety of bicycle locks. The whole wire rope of this lock is about 1.2 meters. Normally, the wire rope can naturally shrink into a ball. If you need to use it, you can stretch it or roll it into two strands to lock the bike. Because of its long steel wire rope, it can lock the bicycle on the railing post or several bicycles together. Therefore, many people like to use this steel wire lock to lock bicycles.