They call 'em "snake-eye" heads. Making a driver bit (or having a handy person do it) would save the risk of breaking an original. The brass ones online are vulnerable in this way. The format is used for security screws, so there might be such a creature available off the shelf somewhere. Probably metric?
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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