10pcs/lot Diamond Coated Core Hole Saw Drill Bit Set Tools Glass Drill Bits Hole Opener for Tiles Glass Ceramic, Round

Have used to drill 10mm hole in marble for door stopper and in ceramic tile for testing.Use water for cooling and keep removing material got stuck on bit for faster drilling.Will update if get chance to drill granite

Moderate item . When you use for drilling ceramics use cold water supply to remove heat otherwise the hard coating at the top will worn out. but for plastic you can use easily without cooling arrangements. Overall usefull for amature s. I recommend this for this price.

Veri nice diamonds bit good working

This is a third class product. I have tested drilling an 8 mm tiles and once one hole is drilled, all threads are gone and cannot be used again to drill another hole.

Used to drill holes in 10mm glass.

Nithing

Not all bits are durable some of them are cheaper quality and diamond grit gets worn out in single use when used coolent with it.

Good product