(1) certificate: the real security doors must be approved by the statutory inspection agencies according to the standard of qualified, and a production enterprise at the provincial level, provincial public security department (bureau) security department issued safety guard products ZhunChanZheng

(2) level: according to the related standards, security doors level of security can be divided into A level, grade B and C level, including A class C locks properties of security, the highest grade B next, A level minimum, we see in the building materials market of most of the is A level of guard against theft, more suitable for general family use

(3) locks: qualified general use of door of guard against theft three party a lock, not only door lock locking up and down, can be inserted into the lock, opposite to fixed. Shoddy, generally have no three locked or customize three locking structure, and do not have security function or often malfunction. Most of the door on the door frame is studded with rubber seal, close door article not issuing a harsh metal crash

(4) process quality: should pay special attention to inspect for welding defects, such as welding, and open not weld, leakage welding, slag wait for a phenomenon. See doors and door with reinforced, and whether the gap is uniform, open is flexible, all the joints is close-grained, paint electroplating is uniform firm, smooth, etc

(5) when buying it should also be noted of door of guard against theft "FAM" marks, name of the enterprise, the content such as standards, conform to the standards of the door to both safe and reliable.