Description for 20mm H Sections: 1st internal Depth 'Board Size' - 2nd external widths - 3rd thickness | M = metres, mm = millimetres.
The 20mm plastic H section has an overall external width of 50mm, a thickness of 3mm and can be used with 20mm boards or panels. Made from rigid PVC, it is available in black and white and can be used both indoors and outdoors. Request a free sample to ensure this is the right trim for you. Browse our full range plastic H sections as we also offer H sections with unequal legs and H interlocking sections with a separate top and base profile.