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Are you anchoring to the slab underneath? If so you can use a diamond bit spraying it down with water, followed by a masonary bit into the slab.
You could use specialist tile drill bits - these have a x-form point like a harpoon. I tend to use hollow diamond bits and cool with water as suggested above. I used a 10mm bit to drill through ceramic tiles into concrete slab below to anchor the structure for a patio bar. Sent from my iPhone using Tapatalk
I do not have to anchor to the slab. I am setting pews in place. What type or brand of diamond drill bit would you suggest. The hole should be 12 mm in diameter.
