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mespilus in reply to @tbc

Concrete gravel boards don't have any reinforcing steels in the thin sections between the 'frame'. Drill, rather than hammer drill holes to limit the cracking.
Drill the 5mm holes in the shape you wish to remove, then as above move up to 8mm, 10mm as necessary. The thin concrete should just fall out.

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Grumpy_Git in reply to @mespilus

I wonder if a multi tool with an abrasive blade would do the job?

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mespilus in reply to @Grumpy_Git

Depending upon the quality of the abrasive blade, it could quite easily take off any rough edges. My concern, without some pre-drilled holes to limit crack propagation, the thin section inset concrete would crack randomly and easily beyond the target diameter.

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