Makita P-66737 25mm Diamond Drill Bit With Water Feed This Makita diamond drill will outperform most traditional tile or glass bits providing a combination of durability, strength, and speed. The supplied drilling guide ensures an accurately placed hole every time, and the integral water reservoir not only acts as a coolant, but also helps keep the dust down. The Makita mini diamond drill will penetrate all tiles including Grade 5 Porcelain, Vitreous ceramics and Granite with ease of speed. FEATURES Professional users will find this a great solution to the large number of holes that have to be drilled in ceramic tiles, in modern bathrooms and kitchens Diamond coated for excellent hole quality and long life Electroplated diamond holesaws Must be used with the wet coolant feeder (supplied) SPECIFICATION Diameter: 25 mm Overall Length: 30 mm