Review on Meccion Extractor Ceramics Porcelain Mandrels by Wayne Ohlrogge

Used 2 inch and smallest and they work great. The trick is in the loss of water and the slow spread of the borer. I've made 20 holes with a drill and it looks like there's a lot of material left. Wear some, but very little. The anodizing has worn away where the height of the tile ends at the cut. (cosmetics only)