Shanghai OneTop is a pioneer EML manufacturer. With over 30 years of professional experience in all kinds of security lock designs and productions, their main product lines include security locks, electric mortise locks, cabinet locks, and fire and safety products.

The security lock series covers EML, drop bolts, door strikes and MEM locks. The fire and safety product series covers delay egress lock and magnetic door holders. Their products have met numerous international standards and certifications in the US, Australia, Japan and China.