Very good value and quality.
I bought a 6mm, 8mm and 10mm to drill porcelain tile. Total cost was less than £6. I've done 20 holes with the 8mm and it is still going. Be sure to keep wet when drilling. I just dipped the end of the bit in a cup of water regularly while doing the hole to ensure the bit does not get hot. Takes about 1 to 2 minutes to go through 8.5mm porcelain tile. As with all of these grinding bits there is no centre point to the bit so care is needed when starting the hole. Either start at 45degrees with a very steady hand, or prepare a template. I used 12mm plywood and drilled holes a little bigger than the tile bit size and taped over the tile markings as a guide. Then just slot in the bit to start the hole in the correct place. The resulting holes are very neat. Very good value and quality.
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