Review on FACHLICH Diamond Porcelain Granite Pieces by Todd Calloway

Renovating two porcelain tile bathrooms I needed to drill a few holes in the tile for glass top supports/fixtures. I went through four or five bits and spent a lot of time drilling through the first three panels. I bought these for the last panel and drilling is much quicker and easier. I drilled four holes with a drill and when I was done it was still in relatively good condition.