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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.
mespilus
Grumpy_Git
I want to make a hedgehog hole in a gravel board.
It needs to be approximately 13cm in diameter.
I have an SDS drill, but no angle grinder.
What's the cheapest way to do this? It doesn't need to be neat because a hedge will hide it, but I don't want to smash the gravel board to pieces.
Is there a way that doesn't involve buying a 110mm hole saw attachment?