Invisible – This fitting is the ideal basis for invisible connections between lightweight boards - 38 or 50 mm thickness with 4 mm outer layers. The fitting is inserted edgeways into the board and fixed to both outer layers simultaneously by glue, forced through specially designed channels. Balanced distribution of forces ensures a solid connection and an end product with high load-bearing capacity. The fitting suits up perfectly with Hettich's popular “Twister dowel” in many practical applications.