These "Security doors" are high-performance (HP) interior doors, normally used as entrance doors to apartments in stairwells. HP doors in the Resistance Class 3 (RC3) has a full burglary protection and this is the type of doors normally defined as true Security doors. A wood-based construction equipped with metal plates, strong hinges and locks for cylinders. These doors are offered unclassified and classified including fire and sound resistance (EI30/R'w35dB, Ei30/R'w40, Ei60/R'w35dB, Ei60/R'w40dB).