The Vitrex 10 2789 Mini Hard Tile Drill Bit Guide is the ideal solution for drilling hard tiles. It features a rubber suction cup for instant positioning and individual slots for the most popular fixing sizes. Combined, these two features ensure ease of use. ion-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; word-spacing: 0px;">Ideal for use with Vitrex Hard Tile drill bits and water-cooling system. ion-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; word-spacing: 0px;">Slot sizes: 4mm, 6mm, 8mm, 10mm and 12mm.