The frames of TUNADOR security doors are of the most modern adaptive type – i.e. "type of accordion”. They consist of two moving parts - external and internal, which come in each other and could cover walls from 14 to 34cm. Stability and strength in the assembly is guaranteed by 10cm profiled steel edge, which lies closely on the wall. The frame is manufactured from 1,5mm DKP steel and is electrostatic painted at 220°С. The total weight of the frame averages 30kg.