This heavy duty metal biscuit can be used as a concealed self clamping connector, for detachable construction such as pipe covers. Clamps are not required as the joint is slid into place and held with the metal lugs. An integral stop can block one side if required. Screwed into place, the biscuit has an adjustable joint pressure. For material from 18mm in wood and wood composites, supplied in packs of 40 pairs connectors, 83 screws of each size 3 x 13mm and 3 x 25mm and a clip for cutting depth.