The Access Hardware T411 U Shaped Bracket is suitable for 20mm board and is available in satin or polished stainless steel. It is used for fixing the board to the wall and is supplied with suitable wood screws and plastic wall plugs.
The U shaped bracket has more stability as it clamps the board on either side when used with the T194 bolt through fixing (available separately in packs of 6). The bolt through fixing ensures the board is strongly and securely fitted to the wall.