The security door is called the "security door." It has both theft and security performance. In accordance with the "General Technical Conditions for Anti-theft Security Doors," the qualified security doors can be opened within 15 minutes using a chisel, screwdriver, crowbar and other hand tools, hand drills and other portable power tools, or a 615 square millimeter opening on the door leaf. Open, or open a 38mm2 opening in the 150mm square half of the locking point. The lock used on the security door must be a dedicated lock with anti-drilling function that has passed the detection of the Ministry of Public Security testing center. See Tian Xiaobian for safety door maintenance: 1. Always wipe the facade with a soft cloth to keep it clean and prevent erosion by corrosive substances. 2. Regularly add a little lubricating grease to the mechanical rotating (transmission) parts such as door hinges, latch bolts, latches, etc. to maintain lubrication, so that the door and lock can be opened and closed flexibly. 3. It is forbidden to insert chores or inject various oils inside the lock core. 4, the doorbell and alarm battery should be replaced regularly to avoid the bell is too small or not ring. When the doorbell or alarm is not used for more than half a year, the battery should be removed. 5. Please keep the expansion bolt firmly connected to the wall and door frame. In addition, there are many kinds of anti-theft doors on the market. According to the standard issued by the Ministry of Public Security, GB25-92 "General Technical Conditions for Anti-theft Security Doors", security doors can be divided into three types: fence-type security doors, physical doors, and composite doors. Doors to buy security doors 
Jingjing Security Door
Wanjia Security Door 
New multi-security door