"Tried several other (cheaper) drill bits before settling on this one. My super hard porcelain tiles defeated all the others but this breezed through without losing all the diamond bits. Quite hard to remove gunge from the centre after drilling though. Also was a tiny bit un-true which makes starting pretty hard. Definitely recommend this."
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Review 3 for Marcrist PG750X Dry Diamond Tile Drill Bit 8 x