Rothenberger Diamond Tile Drill Bits The Rothenberger Diamond Tile Drill Bits, available at Trade Counter Direct, are expertly engineered for precision drilling in hard materials. Designed for use with the Rothenberger Diamond Tile Drilling System, these drill bits deliver clean, accurate cuts in porcelain (Grade 5), granite, glass, marble, and slate. Their robust construction and compatibility with high-speed drills make them an essential choice for professionals and serious DIY users alike. Each drill bit is supplied with a water cooling system to optimise performance and prolong tool life. For best results, operate with a drill speed between 1200 and 2000 rpm, applying only light pressure. Please exercise caution when using water with power tools. Features Designed for use with the Rothenberger Diamond Tile Drilling System Suitable for drilling porcelain (Grade 5), granite, glass, marble, and slate Compatible with high-speed drills (1200–2000 rpm recommended) Supplied with a water cooling system for enhanced durability Enables fast, precise cutting with minimal pressure Available in multiple sizes to suit various applications Specifications SKU 8.9081 (6 x 30 mm), 8.9082 (7 x 30 mm), 8.9083 (8 x 30 mm), 8.9084 (10 x 30 mm) Range/Series Diamond Tile Drill Bits Recommended Drill Speed 1200–2000 rpm Suitable Materials Porcelain (Grade 5), Granite, Glass, Marble, Slate Water Cooling System Included Available Sizes 6 x 30 mm, 7 x 30 mm, 8 x 30 mm, 10 x 30 mm