Abstract: The present invention relates to a boss 1000 for assembly with a part, the boss 1000 having a roughened portion for engaging a face of the part. The present invention also relates to a kit of parts, or an assembly, comprising such a boss 1000, and a bolt, a kit of parts, or an assembly, comprising such a boss 1000, and said part, preferably wherein the part is a strengthening member, and a method of structurally reinforcing a girder, the method comprising determining a section of the girder that requires strengthening and fastening to the girder a strengthening member without removing said section.