B1-1 - B1-1 clips have been engineered for the top and bottom tongues of joining cladding boards to slot into to, allowing for 4mm spacing. If boards are to be fitted vertically, they should be further secured via an all weather adhesive and/or a metal stop.Product InformationThermory® B1-1 FasteningsInvisible fixings for Thermory® cladding with a C6 &amp; C9 profileFit cladding without unsightly face screwsAutomatically allows for 4mm spacingAvailale as well with black coating