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For cylinders with a diameter of 150mm or greater, the appropriate specification for the tamping rod is 16mm with a tolerance of +/- 1mm. This dimension is established to ensure that the rod is sufficiently robust to properly compact concrete within the larger cylinder without damaging the mold or affecting the integrity of the concrete sample being tested.

The use of a rod with this diameter helps achieve a uniform mixture and prevents air pockets, which is critical for accurate strength testing of concrete. Smaller diameters may not provide the necessary compaction force needed for these larger samples, leading to incorrect results. The specified diameter balances the need for effective compaction while maintaining the strength and cohesiveness of the concrete being tested.