In view of the high stresses to which profiles may be subjected, it is always advisable to connect them using Angle Brackets 8 160x160 St.
This profile has a different internal contour to the other construction profiles, which means that standard Fastener Sets 8 cannot be used for connection.
Universal-Fastening Sets 8 St or Automatic-Fastening Sets 8 are recommended for connecting profiles subject to limited stresses.