A 75mm x 10mm flat is attached to the existing face of the slab with concrete anchors at 300mm o.c. The ragged 30x10mm flat is pre-attached with nylon nuts, which is cast into the new slab and will pull away from the 75mm x 10mm as shrinkage occurs. This leaves both edges of the construction joint armoured. This system is ideally suited for 150mm thick slabs and above. This is so the specified dowel can be easily epoxied into the existing slab, under the system.