Angle pieces and shackles GN 967 are preferably used in connection with profile systems. Square connections or connections with same contact area can so be realised in the smallest of spaces and with a high degree of stability. Over and above the profile system configurations, the angle pieces and shackles can also be used for a wide variety of different fixing and retaining tasks, for instance in the design of jigs and fixtures. In the version with identification no. 2, the bores are designed without countersunk hole to allow fixing with socket cap screws, nuts or rivets.