The new standard of door of guard against theft will level of security is divided into a, b, c, d four levels:

First class features: a, the thickness of the steel plate handled 1.0 mm before, after 1.0 mm to 2.0 mm, the woodwork; B, prevent damage time may not be less than 30 minutes, must match the level b lock; C, the door closed, closed point must be 12 point above. D, in the distance ground height 1.6 meters or so of the position on the inner door, with Chinese code "armour" permanently fixed markers.

Characteristics: a, b the thickness of the steel plate handled 1.0 mm before, after 1.0 mm to 2.0 mm, the woodwork; B, prevent damage time may not be less than 15 minutes, lock no requirement; C, the door closed, closed point must be after 10 or more. D, in the distance ground height 1.6 meters or so of the position on the inner door, with Chinese code "b" permanently fixed markers.

Class c features: a, the thickness of the steel plate handled 0.8 mm before, after 0.8 mm to 1.8 mm, the woodwork; B, prevent damage time may not be less than 10 minutes, lock no requirement; C, the door closed, closed point must be more than 8 o 'clock. D, in the distance ground height 1.6 meters or so of the position on the inner door, with Chinese code "c" permanently fixed markers.

The fourth division features: a, the thickness of the steel plate handled 0.8 mm before, after 0.6 mm to 1.5 mm, the woodwork; B, prevent damage time may not be less than six minutes, lock no requirement; C, the door closed, closed point must be 6 points above. D, in the distance ground height 1.6 meters or so of the position on the inner door, with Chinese code "d" permanently fixed markers.