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Connolly® Key Joint is a high quality preformed metal key joint for the control of shrinkage cracking and differential movement in concrete slabs. Key joints can also be curved to suit a custom radius using a back cutting technique. Guarantees a definite break in the slab to relieve shrinkage induced stresses. Joints are set up prior to pouring which means no interruptions to the finishing operations. Knockouts can accommodate a range of dowel sizes and shapes. Available in 100, 150, 200 and 300 mm heights and lengths of 6m.