Cheng Ming's mother-child open lock is one of the series of hanging locks produced by Sanhuan Lock Industry Pujiang Co., Ltd. The material of the open lock can be iron lock body or copper lock body, stainless steel lock body. A key can open more than 2 locks, each lock has a unique key, suitable for the use and management of companies. It has the characteristics of anti-theft, anti-rust, etc., is safe and reliable, and has extraordinary quality. The wholesale price is negotiable.