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My mate Olaf now has sent me pictures of orthoststs with circular holes. In Cornish granite mainly Are there standard diameters for drill cores?Olaf's holes vary from 5-20cms in diameter. One has a central plug intact. The stones are large boulder sizes many thanks I am trying to have Olaf 'treat' with you directly. (Olaf is/was? a big animal vet- so cannot resist pun.) Absolutely no suggestion that anyone on this board is a brute of course. But he prefers the postal service and off-colour photos. All help very welcome. cheers Rob