Description for H sections: 1st internal Depth 'board size' - 2nd external widths - 3rd thickness | M = metres, mm = millimetres
4mm H section joining strips are often used to join boards and panels, and for covering gaps between them. H section joining strips 4mm have two equal legs and are suitable for boards which are 4mm in thickness. See also our range of H joining sections (Unequal) and our two-part H interlocking top & base.