Tile diamond drill bit "Dry", 18 mm, M14. M14 thread for use on angle grinders. Vacuum brazed diamonds for long life and fast drilling progress. Side cutouts for easy removal of drill core. Designed for dry application, no extra cooling required. For successive drilling, it is recommended to cool the crown briefly with water after each drilling! The recommended useful length is the thickness of the tile / porcelain stoneware / granite slab . As a rule, max. 2 cm. Granite slabs / countertops can be drilled up to 5 cm. Here, the crown should be pulled out of the drill hole more often so that it cools down briefly! Important: Do not drill into the substrate when the material is laid!