Great inexpensive bit for drilling into hard porcelain tile. Works in Granite, Marble, Glass, Slate and PorcelainOutperforms the Standard Carbide Bits in both Speed and Number of Holes DrilledEditors’ Choice Award (Tools of the Trade Magazine)Best to use with the water feed attachement and cordless tools.Requires Water LubricationVarious Sizes Available: 3/16” through 1”Click the video tab to watch it in action