It consists of a high-strength alloy steel link and an anti-pick lock core, and the link is covered with a nylon or rubber sheath to prevent scratches on the hub and sprocket.When in use, pass the chain through the rim, rear rocker arm or fixed pile, and after locking it, the wheel rotation is restricted, so that the vehicle cannot be pushed away, nor can the wheel train be disassembled separately, forming a physical barrier.Compared with the U lock, the length of the chain lock is adjustable, which can be linked to multiple cars or fixed to the street view guardrail; compared with the disc brake lock, the chain lock has a larger locking range, which is not easy to be propped open by the jack, and the time cost of fighting scissors and saw blades is higher. It is a common secondary anti-theft solution when traveling, track days, and long-distance motorcycle trips.Daily storage can be placed in the rear seat bag or side box, the weight is moderate, both flexible and deterrent, to provide the knight with visible and safe parking protection.